* Changed CSS for GradeBook buttons to match wp-core-ui. 
* Fixed a bug where cells multiple copies of rows and columns were being displayed.
* Changed CSS for chart view on students gradebook to match that of the admin view.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@882720 b8457f37-d9ea-0310-8a92-e5e31aec5664
More CSS changes: gradebook modals are styled like media library modals.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@883319 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Started to address global namespace pollution - mostly done.
* Fixed a bug where pie chart percentages weren’t displaying correctly (One of the percents would be pushed to the boarder of the pie chart).
* Now you can press escape to exit an add/edit screen.
* Now you can press enter to save on an add/edit screen.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@885161 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated screenshots 3,4, and 6

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@885278 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Global namespace issues have been addressed.  Everything in GradeBook.js is now owned by AN.
* Added sorting on assignment columns - can only sort in ascending order.
* Added highlighting of columns on hover.
* Fixed styling issues where pie chart width to fit within viewing window.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@888483 b8457f37-d9ea-0310-8a92-e5e31aec5664
added list-tables.css

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@888485 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Bug Fix: Edit Assignment and Delete Assignment buttons didn’t disable after a selected assignment was deleted.
* Bug Fix: After editing a student score, sorting broke because the new score was saved as a string.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@889164 b8457f37-d9ea-0310-8a92-e5e31aec5664