Added module Plupload and corresponding integrations in module Blogs and plugin TinyMCE.
A lot of small fixes in components and system core.

System version 0.273
modules:
Blogs 0.045
Comments 0.007
Cron 0.005
Feedback 0.001
HybridAuth 2.1.1-cs20
OAuth2 0.013
Plupload 1.5.7-cs1
Static_pages 0.025
plugins:
Admin_default_theme 0.001
TinyMCE 4.0.1-cs2