Update tablesort

[bjarnef]

I also noticed that a newer version of tablesort is available, so we can update this as well. The latest version is version 1.4.0:
https://github.com/mattiash/angular-tablesort

[warrenbuckley]

Again what do we get from the update and feel free to do a PR, I don't have the time to maintain as much as I would like anymore :-S