Added option to enable dataTable sorting

The user can now disable row reordering and enable sorting by any of
the columns. This can be useful if there is a lot of data and it is
displayed as a sortable table in the front-end so it's order isn't
important.
.DS_Store added to .gitignore
Made the active sorting icons white
Merge pull request #74 from witq/master

Added option to enable dataTable sorting