Add User model

Created User model with following fields:
* User Full Name (string)
* User Handle (string)
* Birthdate (date)
* Gender (integer)

Generated migration, migrated the database.
Add Devise to User

[Refs #72499862]
Add gender enum to User model
Generate devise views for User
Convert erb views to slim

[Refs #72499862]
Remove full_name from User, add first and last names instead

[Refs #72499862]
Add additional fields in the users#sign_up layout

[Refs #72499862]

Added additional info for user to fill in:
* birthdate
* handle
* gender
Generate UsersController

[Refs #72499862]
Add Registrations controller and redirect after sign_up

[Refs #72499862]

Generated Registrations controller that redirects user to the
welcome page (additional info about user).
Added welcome page.
Remove User controller

[Refs #72499862]

Removed User controller that was generated by mistake (controller
name was not plural)
Add update action to UsersController

[Refs #72499862]
Merge branch 'master' of https://github.com/Design-Collective/myteevee2.0 into ft/user-sign-up-72499862

Conflicts:
	Gemfile.lock
	db/schema.rb
Merge pull request #1 from Design-Collective/ft/user-sign-up-72499862

Ft/user sign up 72499862