Mainly fixes for browser action icon not displaying/disappearing properly on enable/disable
Fixed window watcher contexts.
Unregister observers when we are disabled.
Fix circular reference in channel wrapper and incorrect timing of content scripts
Force freeing of jQuery event handlers when extension is unloaded.
Don't load the background window directly from the readystatechange event listener.
Finished feature 47719543/amo-review.
Merge branch 'develop' of github.com:salsita/ancho into develop