Add asynchronous social media library based on Socialite
https://github.com/tmort/Socialite

The over all effect is faster intial pages loads as buttons and widgets
rendered are done in JS after page load has finished and the user
scrolls to the area of the page.

Code has been baking for a month in my staging environment and passes
Google PageSpeed test nicely!
Merge pull request #1104 from GawainLynch/feature/Socilaite

Add asynchronous social media extension based on Socialite
Make sure old settings for 'accept_file_types' are not still picked up.
removed unneeded line.
Whitespace only
Refactored getToken / checkToken out of lib.php.
Bumping version number to 1.6.0 dev
Make sure the cached config is invalidated whenever the version number changes.
Only show the 'DB needs repair!' notice when logged on. Fixes #1046. Fixes #1060.
Missed a 'getToken' in 141338adb.
Make more use of \Request object, more consistent, typo's.
Don't display the 'allowed filetypes' on the Stack. Visual clutter must go.
Tweaking CSS
Tweaking allowed types again. See #1114
Adding new Base-2014 theme as a submodule