Namespace change

@bermudezjd 
Removes project namespace  'ab:'  in favor of instituting a URL naming convention of pre-pending 'ab_testing_tool_'  to given url names.
e.g.
`url(r'^$', render_control_panel, name='index')`
->
`url(r'^$', render_control_panel, name='ab_testing_tool_index')`

Pull request created for record-keeping.