use dataTables to make table sortable and searchable

I started to work on this and thought I'd seek feedback before spending too much time on it. I was looking for a vagrant box this morning and it took me a while to find the right one for what I wanted. I realized that it would be really convenient to be able to filter this table for a specific type of box ('ubuntu', for example), in addition to sorting it. I've used [dataTables](http://datatables.net/) for this kind of thing in the past and its working relatively well.

Additional things that need to be fixed before this should probably be merged into production:
* [ ] fix the URL column width, which [is possible](http://datatables.net/reference/option/columns.width), but doesn't appear to work in this case for some reason.
* [ ] fix the URL copy mechanism. I'm not exactly sure what is going on here, but the ZeroClipboard snippet is not being triggered when clicking the button. This could have something to do with dataTables or it could be something entirely different.

Before I go down a wormhole fixing these things I thought I'd confirm that this would be desirable by @garethr and others.