Change 'Dev tracker' link to 1.0.x branch on Github.
Create generic 'CBox_BBP_Autoload' class.

* This class will house all hotfixes and workarounds for bbPress.
* Move 'CBox_BBP_Site_Public' class code into this new class.
Add workaround for bbPress 2.2.x's dynamic role setter.  Fixes #61.

bbPress 2.2.x's role setter conflicts with blog creation on multisite.

bbPress 2.3 addresses this, but the fix was not backported to 2.2.x.
Therefore, we enforce our own hotfix.

Props @boonebgorges.