Added support for summary and groupingsummary features

 * Modified by Steven Ervin - 2013-Sep-18
 * Added support for summary and groupingsummary features
 * Aligned columns according to grid column's alignment setting.
 * Updated to use columnManager to recognize grid reconfiguration
 * changes under 4.2.1.

Changes tested under 4.1.3 and 4.2.1.
Merge pull request #17 from TexasSteve99/master

Added support for summary and groupingsummary features