Enforce git author name and email

When developing on our dev boxes, especially as a new hire it's possible
to accidentally commit some code using your personal email address.

This hook prevents this problem by checking to make sure all email
addresses end with '@causes.com'.

This also ensures that you provide your full name, e.g. John Doe instead
of just John (I don't think we'll be hiring any mononymous people
anytime soon).

Change-Id: Ibe612a3ca4e08176b4e6d30d3f171d16bec0b2a9
Reviewed-on: https://gerrit.causes.com/17329
Tested-by: Shane da Silva <shane@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>