Expose a mode to not show the transformation list

Test Plan:
 * add a transformer to test.html
 * try the rotation tool in all four modes
 * make sure there were no javascript errors
 * make sure the tool shape moves if expected to
 * make sure the transformation list is visible in "with text" mode
 * make sure the transformation list is hidden in "without text" mode

Reviewers: alex

Reviewed By: alex

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D5876