Revert "Add Ember.SimpleAuth authentication"

This reverts commit 51c080cca9501d1d99e9d50097cd695a253a619c.

Conflicts:
	app/controllers/login.js
	app/initializers/authentication.js
	app/routes/application.js
	app/templates/application.hbs
	app/templates/login.hbs
	bower.json