First pass
Revert back to Pauls plugin
Check that bbPress is active
Check that BuddyPress is active
Check that BuddyStream is active
Shift the include into a better place
Check that Invite Anyone is active
Check that BuddyPress Courseware (ScholarPress) is active
Check that WP E-Commerce is active
Add extra conditionals for WP-Ecommerce
Add extra conditionals for Courseware
Add extra conditionals for Invite Anyone
Add extra conditionals for BuddyStream
Add extra conditionals for BuddyPress
Add extra conditionals for bbPress
Merge pull request #98 from BronsonQuick/activeplugins

Only show achievement types in the wp-admin lists if the respective plugin is active. Fixes #98, props BronsonQuick.