Added Yahoo logo (Y on white bg) and Google (from Google favicon)

Signed-off-by: BARBIER J.M <jm.barbier@solidev.net>
Added OpenId logo

Signed-off-by: BARBIER J.M <jmbarbier@pcepepe.(none)>
Added Kickstarter
Added kickstarter png sizes
Added Klout
Added Reddit
Added Indiegogo
Added Instapaper
Added G+ Hangouts
Merge pull request #17 from jmbarbier/master

Added contributed Google favicon + Yahoo! + OpenId icons
Created fully-functional version of contributed Google icon
Fixed some ordering
Created fully-functional version of contributed OpenID icon
Updated README to reflect contributions (and amended contributions)
Added Community section to Readme
Added SCSS support, simplified filenames
Add KDE icon