Updates to MRT extension. Trac #21120 01/30/2013 dgkoch add issue 6 and clear interactions renamed to EXT_draw_buffers based on feedback changed resolution of issue 3. git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1812 736b8ea6-26fd-11df-bfd4-992fa37f6226