Integrated github-widgets.

Added lib javascript bundle:
-updated Gruntfile, updated script links
Added github-widgets to lib bundle (unminified file),
Added style for github-widgets.
Updated jquery file with unminified file.
Fixed Firefox constant alert popdown issue: iframe load event always fired
Updated posts and readme
Removed old sass import
Added visibility:hidden to side-non/responsive for screen readers
Added html5shiv if less than ie9
Pngout script WIP