Create roles for Git user, Git vetted user

Here's a start anyway.

However, you get killed as an auth user checking the "I agree" checkbox with this:

( ! ) Fatal error: Class 'Database' not found in /Users/webchick/Sites/mydrupalorg/sites/all/modules/dbtng/dbtng.module on line 106
Call Stack
#	Time	Memory	Function	Location
1	0.0007	75548	{main}( )	../index.php:0
2	0.4820	13781208	menu_execute_active_handler( )	../index.php:18
3	0.5028	13898556	call_user_func_array ( )	../menu.inc:348
4	0.5028	13898880	user_edit( )	../menu.inc:0
5	0.5029	13899156	drupal_get_form( )	../user.pages.inc:239
6	0.5571	14459220	drupal_process_form( )	../form.inc:121
7	0.6006	14488284	form_execute_handlers( )	../form.inc:422
8	0.6007	14491092	user_profile_form_submit( )	../form.inc:782
9	0.6026	14491556	user_save( )	../user.pages.inc:292
10	0.6185	14502200	user_module_invoke( )	../user.module:216
11	0.6399	14506328	drupalorg_git_gateway_user( )	../user.module:22
12	0.6399	14506764	drupalorg_git_gateway_user_update( )	../drupalorg_git_gateway.module:33
13	0.6399	14508272	db_merge( )	../drupalorg_git_gateway.module:258

This is confusing because autoload module is enabled. Hm.

Anyway committed this as a starting point.

I think that might just have been a caching issue, actually.

However, I still need to figure out what bit to twiddle so that these folks have their "Git access" checkboxes checked out of the box.