Application Cleanup

Here I:

* Fixed various styles that could use improvement, including the messaging when a user performs some action. Previously it displayed unstyled text.
* Removed all files from the vendor directory which were not being used. This means they no longer include all the optional scripts, HTML docs etc. This makes it easier for the Mozilla reviewers to make sense of what is a fairly large code base as far as extensions go.
* Provided a listing of the sources of the vendor files in `vendor/README.md'. This will help the Mozilla reviewers check that we are using bit-exact copies of the libraries.