OOD is not showing /register link for campus users

[jprorama]

The /register link works as intended for users without "@uab.edu" in their REMOTE_USER but users who have "@uab.edu" see the default failure to map error message.

I suspect this is due to the parsing in our .regex mapping function. We likely need to update it to check for actual accounts being defined.

[diedpigs]

Should be fixed with #50