Adds front-end templates/javascript.

Backbone.js, handlebars.js, underscore.js (for backbone), and of course jQuery and fabric.js required on front end.
Debugs csrf stuff (still not great).
Changes models, implements subject view.
Makes frontend render predicate form after subject submit.

(Fun closure stuff in there, yay Javascript)
Implements predicate view.
Implements predicate view.
Merge pull request #3 from jbbrokaw/test-subj-pred-views

Implements and tests subject and predicate views.