addressing #1056 & #85
really fixing #1056
adding icon-xing, icon-xing-sign addressing #329
adding icon-dropbox #358
adding icon-stackexchange #251
adding icon-instagram #359
adding icon-flickr #166
adding icon-adn #430
adding icon-bitbucket, icon-bitbucket-sign #31
adding icon-tumblr, icon-tumblr-sign #178
adding long arrows #1081
adding apple, linux, android, and windows icons #113
adding icon-compass #817
adding icon-dribble #148
adding icon-skype #172
adding icon-foursquare #421
adding icon-trello #334
Merge remote-tracking branch 'origin/3.2.0-wip' into 3.2.0-wip