[extension] Initial stub

* Directive linked in GH page

Issues:

* Missing CSSs
* Link GH commit textarea
* Remove GH Merge Button(™)
Adds jQuery lib

Its needed to store the lib with the project for use it in a chrome extension
Merge branch 'gh-pages' into chrome-extension
Apply GitHub styles to some buttons in the Chrome Extension
Change options submit label
Add styles
Replace original GitHub merge form with GHGFK Merge Button (ntm)
Avoid CSS conflicts with GH CSSs
Merging pull request #2 with Google Chrome Extension