Restructure CBOX_Frontend class so some classes can be autoloaded.

Because we want our 'CBox_GES_All_Mail' class to be autoloaded (see #30),
we need to add some logic to allow this to happen.

Create new setup_globals() method - grabs existing settings from the CBOX
admin settings page and merge it with our autoloaded classes.
Remove 'All Mail' option from CBOX settings page. See #30.

This option is now autoloaded by CBOX.  See commit e9dd0e6.
Update phpDoc in frontend-ges.php.
Pin BuddyPress Docs 1.2.9
Move frontend autoload classes into a separate method.
Force bbPress so site is always seen as public. Fixes #56.

* Add new file - frontend-bbpress.php
* Add class - 'CBox_BBP_Site_Public' - to override bbP's site
visibility so forum-related activity can be recorded by BuddyPress.
Add class to 'autoload' array.
Update phpDoc for frontend-ges.php.
Pin BuddyPress 1.6.3.
Pin Bebop 1.2.2.
Updates readme
Merge branch '1.0.x' of github.com:cuny-academic-commons/commons-in-a-box into 1.0.x