Fixing dependency system for javascriptresponses. In particular, adding a location for node-only packages (that are never sent to the client) in lms/lib/node_modules and adding lms/static/js, lms/static/coffee/* to the NODE_PATH, along with the course's data directory.

Edit link fix

merging this now because the it looks ok, and it fixes some bugs introduced by the last xserver merge, which are preventing the LMS from running in the current version of master.

Adding a method of executing scripts fetched via AJAX in IE8+. Also adds inputtype-specific handlers so that javascript can be executed when an inputtype is encountered.

Adding javascriptresponse. This responsetype is a framework for problems that are entirely controlled by javascript and graded by Node.js on the server.

Removing compiled js files in data directories before recompiling them; this causes compilation errors to fail loudly.

Kimth/lms coderesponse

LMS migration

and modify course_navigation correspondingly