Facebook plugin: Handle FB Oct-2013 Likes changes

Rather than a count on posts, likes are presented as a paginated array.
Added test for new style and normalize both presentations into a standard
format during stream processing.

Closes #1717, closes #1760
Remove all Bootstrap 2 assets, add minified Bootstrap 3 CSS and js, and update header references.
Properly escape ampersands when constructing permalink URLs.

Minor edit so that the markup validates properly.
Replace BS2 spans with BS3 col-md

Reflects the responsive-by-default markup of Bootstrap 3.
Add missing alt attributes to images so output validates

Helps with troubleshooting HTML errors.
Update Footer to use new semantics for hiding content on smaller viewports

Bootstrap 3 uses hidden-sm instead of hidden-phone.
Update all mini buttons to be extra small buttons

Bootstrap 3 says btn-mini is now btn-xs.
Update form group markup and install navigation for Bootstrap 3
Reskin permissions error page to match new look and use Bootstrap 3.
Update inline help in utility pages to use help-block class instead of help-inline class

Further Bootstrap 3 compliance.
Refactor markup for installation steps to match new Bootstrap 3 semantics.
Update templates on last few auxiliary pages to migrate them to Bootstrap.
Update Twitter plugin detail page to use Bootstrap
Update tests for new markup
Add a comment so our tests know we're in upgrade mode.
Capitalization fix for test compliance
Remove templates and indexes for Dashboard, Posts, Users and old install templating.
Remove conditional non-bootstrap includes.
Minor bootstrap markup updates for session pages.
Removing *lots* of unneeded assets.