Revert "Merge pull request #804 from edx/valera/lti_module"

This reverts commit 2894b21c32b7cd853b00442ae62e0a4c4bf7da71, reversing
changes made to 34d0fe1554db3711eaaf0e4b783e22ff6b52d203.
Merge pull request #895 from edx/alex/revert_unsquashed_pr

Revert "Merge pull request #804 from edx/valera/lti_module"