Add more window globals and shims in task shell

This allows jQuery to be successfully loaded from a web worker
since it does not have a document or window object by default.

Previously it would log about missing methods and properties.

Closes #228

spec/fixtures/jquery-task-handler.coffee

@@ -0,0 +1,4 @@
+module.exports =
+  load: ->
+    $ = require 'jquery'
+    callTaskMethod('loaded', $?)

spec/stdlib/task-shell-spec.coffee

@@ -0,0 +1,23 @@
+Task = require 'task'
+
+describe "Task shell", ->
+  describe "populating the window with fake properties", ->
+    describe "when jQuery is loaded in a web worker", ->
+      it "doesn't log to the console", ->
+        spyOn(console, 'log')
+        spyOn(console, 'error')
+        spyOn(console, 'warn')
+        class JQueryTask extends Task
+          constructor: -> super('fixtures/jquery-task-handler.coffee')
+          started: -> @callWorkerMethod('load')
+          loaded: (@jqueryLoaded) ->
+
+        task = new JQueryTask()
+        task.start()
+        waitsFor "web worker to start and jquery to be required", 5000, ->
+          task.jqueryLoaded
+        runs ->
+          expect(task.jqueryLoaded).toBeTruthy()
+          expect(console.log).not.toHaveBeenCalled()
+          expect(console.error).not.toHaveBeenCalled()
+          expect(console.warn).not.toHaveBeenCalled()

src/stdlib/task-shell.coffee

@@ -12,6 +12,19 @@ self.console =
   log: -> callTaskMethod 'log', arguments...
   error: -> callTaskMethod 'error', arguments...
 
+window.document =
+  createElement: ->
+    setAttribute: ->
+    getElementsByTagName: -> []
+    appendChild: ->
+  documentElement:
+    insertBefore: ->
+    removeChild: ->
+  getElementById: -> {}
+  createComment: -> {}
+  createDocumentFragment: -> {}
+self.document = window.document
+
 # `callTaskMethod` can be used to invoke method's on the parent `Task` object
 # back in the window thread.
 self.callTaskMethod = (method, args...) ->
@@ -19,9 +32,10 @@ self.callTaskMethod = (method, args...) ->
 
 # The worker's initial handler replaces itself when `start` is invoked
 self.handler =
-  start: ({resourcePath, requirePath, handlerPath}) ->
-    self.resourcePath = resourcePath
-    window.resourcePath = resourcePath
+  start: ({resourcePath, globals, requirePath, handlerPath}) ->
+    for key, value of globals
+      self[key] = value
+      window[key] = value
     importScripts(requirePath)
     require 'config'
     self.handler = require(handlerPath)

src/stdlib/task.coffee

@@ -17,7 +17,10 @@ class Task
 
   startWorker: ->
     @callWorkerMethod 'start'
-      resourcePath: window.resourcePath
+      globals:
+        resourcePath: window.resourcePath
+        navigator:
+          userAgent: navigator.userAgent
       requirePath: require.getPath('require')
       handlerPath: @path