Refactor LTI XModule code from the edx-platform repo to this XBlock repo

.gitignore

.pep8

.travis.yml

LICENSE

Makefile

NOTICE

README.md

README.rst

lti_consumer/__init__.py

lti_consumer/exceptions.py

lti_consumer/lti.py

lti_consumer/lti_consumer.py

lti_consumer/oauth.py

lti_consumer/outcomes.py

lti_consumer/static/css/student.css

lti_consumer/static/js/xblock_lti_consumer.js

lti_consumer/static/sass/student.scss

lti_consumer/templates/html/lti_iframe.html

lti_consumer/templates/html/lti_launch.html

lti_consumer/templates/html/student.html