Added new class view

Created method in classroom_controller and basic form for the student
Classroom view completed

Functional for both student and teacher user types. CSS styling has not been added yet.
Teacher's create classroom form functional

Form routes through classroom controller's create function. "New" function is hit when the form loads.
Student can now add themselves to class

Both student and teacher forms on the classroom create page are functional. Created add_student_to_class method in the classroom model. Classroom controller's create method either creates class or adds user to class depending on current user type.
Merging new classroom views with master

Merge branch 'master' of https://github.com/whoisglover/FrogPress into new_classroom_views
Merge pull request #18 from whoisglover/new_classroom_views

New classroom views