added signup template and wired createUser without using the Meteor {{> loginButtons}}
added mentor and student signup buttons on courses page
beginning to add mentor signup to class
add conditions for creating and updating mentors objs in mentors collection
added signin template and js files
added student/mentor usertype on account creation. changed logic for button rendering on courseshome page
added button rendering logic based on student signup status
fixed make admin functionality
added password based user signin
Merge pull request #12 from MissionBit/user-signup

User signup