Created by: sashamor
Updated the glyphicons set to use v1.6, and added a variable to the LESS sheets.
Also added a 'grey', shadowed version of the glyphicons (as well as normal and white), and added an example of it to the docs.
Fixed a small typo in variables.css (which is why the previous pull request was cancelled).
From the Glyphicons changelog to v1.6:
11.04.2012 (All PNG files have been optimized by ImageOptim - http://imageoptim.pornel.net/)
GLYPHICONS 1.6
New Glyphicons: filter gamepad playing_dices sampler web_browser share piano candle turtle rabbit blog dashboard certificate calculator book_open iphone_shake pin_classic pin_flag tie wallet globe briefcase suitcase thumbs_up thumbs_down hand_right hand_left hand_up hand_down fullscreen shopping_bag hdd nameplate nameplate_alt vases announcement dumbbell file_import file_export bell pinterest dropbox google+_alt jolicloud yahoo blogger picasa amazon tumblr wordpress
New Halflings: hdd announcement bell certificate thumbs_up thumbs_down hand_right hand_left hand_up hand_down circle_arrow_right circle_arrow_left circle_arrow_top circle_arrow_down globe wrench tasks_progress filter briefcase fullscreen
Changed/fixed icons: circle_arrow_left circle_arrow_right circle_arrow_top circle_arrow_down settings fire table message_flag message_lock message_new folder_lock folder_flag folder_new tree_conifer