Changed the "Add a member" form to now be user-facing, instead of having an admin do it manually. The welcome page includes a link to "Sign Up," which brings the user to
the "Add a Member" form, now titled "Registration," added a password field and a password verification field (if these fields dont match, the page will re-render and an error
message will be flashed. Removed the "officer" checkbox from this page too.

Added a column to the Member database schema: "request" will be true if the member has requested to join, and false when they are approved.
also overrided the "authorize" method to deny access if the user exists, but has "true" for their request field.
Merge branch 'master' of https://github.com/ajm188/SpartanRunningClub

Conflicts:
	app/views/welcome/home.html.haml
	db/schema.rb
Merge pull request #1 from hschmack/master

User registration changes