[RFE] Client side validation

[EmilyDirsh]

Client side validation is a big usability enhancement. It allows users to get immediate feedback and correct errors without having to wait for an http request/response.

The RFE is for implementing a client-side validation solution for Glitter Gallery.

Some of the forms/fields that should be validated include:
Sign up: email address, username, password
Projects: project name
Files: file type, file size

The solution implemented should be flexible enough for future needs.

[sbagroy986]

I'll do this as well :P

[sbagroy986]

@EmilyDirsh would this work?
http://gyazo.com/db4f88b650b7b5f2aa36199ba4f241fc
http://gyazo.com/374cabfaf41c64da9b40deed26bac174

[sbagroy986]

I closed the PR for the file validations ( using the MIME magic numbers ). I'll send a PR for that and this together, after making the necessary changes here.

[sbagroy986]

@EmilyDirsh I have the PR ready please give this a look :)

[EmilyDirsh]

@sbagroy986 is the PR open? I don't see it in the list.

[sbagroy986]

I have the PR ready to be sent but wanted you to check out the screens, in case you wanted some changes

[EmilyDirsh]

@sbagroy986 screens LGTM - go ahead and send in the PR.