Validate input username

[arecker]

Greetings,

This is commit addresses #35. I added a method to validate the username coming in to make sure the google username is used instead.

If the user has a google apps domain (something like jstudent@my.wheaton.edu), the full username should be used. Basically, just checks the string for @gmail.com. Same rules as logging into gmail.

Let me know if I'm missing something or not following your standards. This was just an impulsive commit to a project I just found. I would love to work on this and help out. I love hangouts, but the Google client looks like crap in tiling WMs.

[tdryer]

#35 isn't very clear. One user reported not being able to log in with an email address, but an email address should be what users log in with, since this is what the login form asks for, and it'll work the same way for users with a custom domain.

Thanks for your interest though!

[arecker]

Thanks for looking at it! No problem - totally get it.