Add app initializers which sets window.Travis

We still use Travis in some places in the app and Travis var is not set when
using ember build. The initializer added in this commit sets it to the current
app instance

app/initializers/app.coffee

@@ -0,0 +1,10 @@
+initialize = (container, app) ->
+  if typeof window != 'undefined'
+    window.Travis = app
+
+Initializer =
+  name: 'app'
+  initialize: initialize
+
+`export {initialize}`
+`export default Initializer`