Addressing issues #68 and #73, regarding cell selection. Implementing proper will/did select/deselect, multiple selection handling, and editing (revealing the utility buttons) while selected. Oh, and updated the readme, too.

Signed-off-by: Matt Nunes <matt@mattnunes.com>
Merge pull request #1 from mattnunes/master

Addressing issues #68 and #73, regarding cell selection. Implementing pr...