Added methods \cs\User::avatar() and \cs\User\Properties\avatar() backed by Gravatar.
Small usability improvements.

System version 0.331
modules:
Blogs 0.058
Comments 0.016
Cron 0.008
Feedback 0.005
HybridAuth 2.1.1-cs27
OAuth2 0.019
Photo_gallery 0.010
Plupload 1.5.7-cs10
Static_pages 0.033
plugins:
Admin_default_theme 0.005
Fotorama 4.3.4.1-cs1
SimpleImage 2.3-cs1
TinyMCE 4.0.5-cs1