Brand story can be expanded and contracted

spec/javascripts/unit/darkswarm/controllers/home_controller_spec.js.coffee

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+describe "HomeCtrl", ->
+  ctrl = null
+  scope = null
+
+  beforeEach ->
+    module 'Darkswarm'
+    scope = {}
+
+    inject ($controller) ->
+      ctrl = $controller 'HomeCtrl', {$scope: scope}
+
+  it "starts with the brand story contracted", ->
+    expect(scope.brandStoryExpanded).toBe false
+
+  it "toggles the brand story", ->
+    scope.toggleBrandStory()
+    expect(scope.brandStoryExpanded).toBe true
+    scope.toggleBrandStory()
+    expect(scope.brandStoryExpanded).toBe false