Add option to have a custom 'verification sent'

Instead of just kicking the user back to the homepage after the
verification email has been sent. Fixes unclear behavior and has the
potential to increase usability.
Also redirect to verification sent page on resend
update to match rydurham's feedback
Merge branch 'master' of git://github.com/wnajar/Sentinel into wnajar-master

Conflicts:
	src/controllers/UserController.php
Merge branch 'wnajar-master'