Added Help menu located at the top right of the page.  There you’ll find information on how to interact with the gradebook.Reduced the amount of ajax calls when building the gradebook for a particular course.  Before 4 ajax calls took place, and the page had to wait till all calls returned successfully before rendering.  Now there is just one ajax call.  This had a significant impact on the load times.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@1026101 b8457f37-d9ea-0310-8a92-e5e31aec5664