Warning when running Figwheel without cleaning

In short, if I run `lein figwheel` twice, without cleaning in between, then in the second session I get a compiler warning any time I try to access a variable&mdash;even though the variable is defined, and its value is correctly printed.

Here are the precise steps to reproduce, along with my version and OS information:

```
Temporary % neofetch
                -/+:.           raxod502@Radon-MBP-New.local
               :++++.           ----------------------------
              /+++/.            OS: OS X El Capitan 10.11.6 15G1212 x86_64
      .:-::- .+/:-``.::-        Model: MacBookPro11,3
   .:/++++++/::::/++++++/:`     Kernel: 15.6.0
 .:///////////////////////:`    Uptime: 23 hours, 36 minutes
 ////////////////////////`      Packages: 365
-+++++++++++++++++++++++`       Shell: zsh 5.2
/++++++++++++++++++++++/        DE: Aqua
/sssssssssssssssssssssss.       WM: Quartz Compositor
:ssssssssssssssssssssssss-      Terminal: iTerm2
 osssssssssssssssssssssssso/`   CPU: Intel i7-4980HQ (8) @ 2.80GHz
 `syyyyyyyyyyyyyyyyyyyyyyyy+`   GPU: Intel Iris Pro, NVIDIA GeForce GT 750M
  `ossssssssssssssssssssss/     Memory: 3187MB / 16384MB
    :ooooooooooooooooooo+.      &#8203;
     `:+oo+/:-..-:/+o+/-        &#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;&#9608;
                                &#8203;

Temporary % rm ~/.lein/profiles.clj
Temporary % lein --version
Leiningen 2.7.1 on Java 1.8.0_112 Java HotSpot(TM) 64-Bit Server VM
Temporary % lein new reagent funk
Generating fresh 'lein new' Reagent project.
Temporary % cd funk
funk % lein figwheel
Figwheel: Cutting some fruit, just a sec ...
Figwheel: Validating the configuration found in project.clj
Figwheel: Configuration Valid :)
Figwheel: Starting server at http://0.0.0.0:3449
Figwheel: Watching build - app
Figwheel: Cleaning build - app
Compiling "target/cljsbuild/public/js/app.js" from ["src/cljs" "src/cljc" "env/dev/cljs"]...
Successfully compiled "target/cljsbuild/public/js/app.js" in 9.21 seconds.
Figwheel: Starting CSS Watcher for paths  ["resources/public/css"]
Figwheel: Starting nREPL server on port: 7002
Launching ClojureScript REPL for build: app
Figwheel Controls:
          (stop-autobuild)                ;; stops Figwheel autobuilder
          (start-autobuild [id ...])      ;; starts autobuilder focused on optional ids
          (switch-to-build id ...)        ;; switches autobuilder to different build
          (reset-autobuild)               ;; stops, cleans, and starts autobuilder
          (reload-config)                 ;; reloads build config and resets autobuild
          (build-once [id ...])           ;; builds source one time
          (clean-builds [id ..])          ;; deletes compiled cljs target files
          (print-config [id ...])         ;; prints out build configurations
          (fig-status)                    ;; displays current state of system
  Switch REPL build focus:
          :cljs/quit                      ;; allows you to switch REPL to another build
    Docs: (doc function-name-here)
    Exit: Control+C or :cljs/quit
 Results: Stored in vars *1, *2, *3, *e holds last exception object
Prompt will show when Figwheel connects to your application
To quit, type: :cljs/quit
cljs.user=> funk.core/home-page
#object[funk$core$home_page "function funk$core$home_page(){
return new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"div","div",1057191632),new cljs.core.PersistentVector(null, 2, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"h2","h2",-372662728),"Welcome to funk"], null),new cljs.core.PersistentVector(null, 2, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"div","div",1057191632),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"a","a",-2123407586),new cljs.core.PersistentArrayMap(null, 1, [new cljs.core.Keyword(null,"href","href",-793805698),"/about"], null),"go to about page"], null)], null)], null);
}"]
cljs.user=> ^D
funk % lein figwheel
Figwheel: Cutting some fruit, just a sec ...
Figwheel: Validating the configuration found in project.clj
Figwheel: Configuration Valid :)
Figwheel: Starting server at http://0.0.0.0:3449
Figwheel: Watching build - app
Compiling "target/cljsbuild/public/js/app.js" from ["src/cljs" "src/cljc" "env/dev/cljs"]...
Successfully compiled "target/cljsbuild/public/js/app.js" in 1.323 seconds.
Figwheel: Starting CSS Watcher for paths  ["resources/public/css"]
Figwheel: Starting nREPL server on port: 7002
Launching ClojureScript REPL for build: app
Figwheel Controls:
          (stop-autobuild)                ;; stops Figwheel autobuilder
          (start-autobuild [id ...])      ;; starts autobuilder focused on optional ids
          (switch-to-build id ...)        ;; switches autobuilder to different build
          (reset-autobuild)               ;; stops, cleans, and starts autobuilder
          (reload-config)                 ;; reloads build config and resets autobuild
          (build-once [id ...])           ;; builds source one time
          (clean-builds [id ..])          ;; deletes compiled cljs target files
          (print-config [id ...])         ;; prints out build configurations
          (fig-status)                    ;; displays current state of system
  Switch REPL build focus:
          :cljs/quit                      ;; allows you to switch REPL to another build
    Docs: (doc function-name-here)
    Exit: Control+C or :cljs/quit
 Results: Stored in vars *1, *2, *3, *e holds last exception object
Prompt will show when Figwheel connects to your application
To quit, type: :cljs/quit
cljs.user=> funk.core/home-page
----  Compiler Warning on   <cljs form>   line:1  column:1  ----

  Use of undeclared Var funk.core/home-page

  1  funk.core/home-page
     ^---

----  Compiler Warning  ----
#object[funk$core$home_page "function funk$core$home_page(){
return new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"div","div",1057191632),new cljs.core.PersistentVector(null, 2, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"h2","h2",-372662728),"Welcome to funk"], null),new cljs.core.PersistentVector(null, 2, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"div","div",1057191632),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Keyword(null,"a","a",-2123407586),new cljs.core.PersistentArrayMap(null, 1, [new cljs.core.Keyword(null,"href","href",-793805698),"/about"], null),"go to about page"], null)], null)], null);
}"]
cljs.user=>
```

Additional info:

* The problem appears to not occur if I run `lein clean` before running `lein figwheel` the second time.
* The warning has been reproduced using the same steps on Linux.
* The same thing happens if I wipe my `~/.m2` repository before performing the same steps as above.
* The same thing happens whether I open `localhost:3449` before starting Figwheel or after.
* The same thing happens in Safari, Firefox, and Chrome.
* The same thing happens whether I visit `localhost:3449` or `0.0.0.0:3449`.

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Warning when running Figwheel without cleaning #132

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Warning when running Figwheel without cleaning #132

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