Removing testing code
Whitespace
Introduces bp_docs_get_group_tab_name().
Refactor of admin panel

This changeset moves the admin panel from under the BuddyPress settings
panel to under the BuddyPress Docs top-level CPT menu.

This means better adherence to the WordPress Settings API.

This changeset also introduces support for changing the main Docs slug
through the admin panel. This is a variation on something originally
patched by @dcavins. Fixes #346.
E_STRICT