using dataTables to make table sortable and searchable
got rid of infinite scroll
left only numbers in the size column (no units, which is now in header)
replaced <th> tags in table body with <td> tags
Closing #309

This merges in https://github.com/deanmalmgren/vagrantboxes-
heroku/commit/e4a827e68bdf865269c20518b1051f36e6c2ff84 and
https://github.com/deanmalmgren/vagrantboxes-
heroku/commit/05ef6d99852e9b71ebd91407d835b583aa4690f5 and
https://github.com/deanmalmgren/vagrantboxes-
heroku/commit/bca01d3024cc0f0eb85b289e7980e993a5c4afc2 and
https://github.com/deanmalmgren/vagrantboxes-
heroku/commit/1ffbf61c6da6f09f0f7adc82e74690472668a7ae

Please note, I have added additional styling to bring it back into line
with the sortable layout we were using.
Tidy up the comments and fix the position of the head tag
Merge branch 'deanmalmgren-datatables' - closing #309