fix a11y error in help modal
LMS startup needs to initialize the modulestores so that we don't lazy load all of the XML courses on first HTTP request
fix focus management for help modal
add ESC key functionality to forgot password modal
Merge pull request #1135 from edx/hotfix/lms-startup
Merge pull request #1136 from edx/hotfix/lms-a11y
Merge branch 'release'