Form validation (frontend and backend) on register

[wspurgin]

Related to #37

From what I can tell there is no form validation on either backend or frontend. The backend only checks to make sure the parameters aren't empty. here's the code

Steps: Click the register link. Enter invalid information (bad emails, mismatched passwords, etc). Create account. Welcome message shown.

[AustinCWells]

@chrismhauser you may want to consider using percents to solve this.