Front page tweaks

Cleaned up front page for a more minimal login screen. Tested on Chrome.
Added Screenshot
Merge pull request #21 from surajram/master

Minimal Front Page
Made Clean Sign In More Flexible
Cleaned up CSS for Sign In
Copied to extension folders
Cleaned up thumbnail container in tweet box
Styled who to follow box
Updated Safari Extension
Updated Chrome Extension
Merge remote-tracking branch 'upstream/master'