Columns Button: Moved column selection from new column to button above table
Column Buttons: re-target event listener to trigger column visibility
Merge branch 'column-button' of github.com:evliu/reactive-table
Fix width and position of columns button.
Update tests and version number.
Update README for 'Columns' button.
Update table-features example for columns button.
Automatically use fontawesome if it's installed.
Add missing semicolon.
Update README for automatic fontawesome use.