Fixing broken WIndows unit tests for #129
Fine turning unit tests for Linux font rendering.
Updating Nested Rows example to include Backbone equivalents for #131
Another tweak to font pixel unit test
Allow group rows to have custom colspan for #132
Unit test for new group colspan functionality
Fix broken JSCS test.
Group rows can now have a custom dataExtractor for #132
Run group data extractors at initialization so that group rows can have a custom comparator.
Merge pull request #2 from globexdesigns/master

Merge from upstream.