Use nfreeze and nthaw instead of freeze and thaw
Merge pull request #23 from pstaabp/master

Another try to get updates merged.
Grab more updates from Peter
add alias to pg/VERSION from webwork2
Revert  thaw back to thaw
Merge branch 'ww2.5.2' of https://github.com/mgage/webwork2-dev into ww2.5.2
add configurations switch for Homework Manager and adjust display in main menu
Define Constants::WEBWORK_DIRECTORY   from ENV  if it not already defined
Compare library version to be greater than or equal to 2.0 rather than equal to 2.0
Fix capitalization error for Backbone.js to backbone.js
Compare libraryVersion is greater than 2.0 rather than equal to 2.0

Merge remote-tracking branch 'origin/ww2.5.2' into ww2.5.2
Fix another capitalization mismatch
Capitalization error -- one more
Merge branch 'ww2.5.2' of https://github.com/mgage/webwork2-dev

Conflicts:
	htdocs/js/apps/ClasslistManager/classlistManager.js
	htdocs/js/apps/FrontPage/FrontPage.js