added custom route to remove a student from a class and tested

See classroom_controller for remove_student method
Created teacher view of classroom/:id page

This includes helper methods in the classroom model to get things like recent assignments and class roster
Fixing small merge conflict, no real conflicts

Conflicts:
	app/controllers/classroom_controller.rb
	app/models/classroom.rb
	config/routes.rb
finish initial setup of classroom show partials
Merge pull request #19 from whoisglover/classroom_index

Classroom show pages