Add gravatar helper method
Update some options
Add admin_asset helper
Update admin theme, now using AdminLTE
Update license
Replace pages count using articles count
Add pagination.perpage option
Add Article repository
Add findOrFail method, return new Article instance in getArticle method
use getArticle method
Fix class User not found
php doc
Merge remote-tracking branch 'pingpong/master'

Conflicts:
	src/Pingpong/Admin/Controllers/ArticlesController.php
	src/views/articles/create.blade.php
	src/views/articles/edit.blade.php
	src/views/articles/index.blade.php
Fix missing function from merge
Added Properties section in PingPong Admin