Feature signup

Created user signup (with very basic bootstrap styling for legibility)
Added cucumber test structure.

Made user_controller create usable with 3 required boolenas for customer, vendor, and blogger.
Blogger is false by default... i figured for the moment we should manually give bloggers blog ability instead of having them sign up for it.

Customer and vendor are mutually exclusive.

Rspec and Cucumber tests written for signing up... I'm sure we can add to /fix them up.