ERROR_PAGE constant renamed into ERROR_CODE.
Page::error_page() renamed into ::error(), and now accepts two parameters.
API requests by default have Content-Type: application/json, if this is not redefined by module.
All API errors standardized.
Added method Page::json().
Added several public API methods and documentation in System module.
OAuth2 module fixes and improvements.
Added trigger System/Config/pre_routing_replace
Other small fixes.

System version 0.212
modules:
Cron 0.004
Blogs 0.029
HybridAuth 2.1.1-cs8
OAuth2 0.009
Static_pages 0.023
plugins:
Admin_default_theme 0.001
TinyMCE 3.5.8-cs4