Use correct extension for versions partial

* Rename .erb to .html.erb
Remove faulty javascript call

* We haven’t had versions JS for a while now
Cleanup version and changeset display

* Generate a human readable title based on the type of changes
* Use ordered lists, definition lists and bootstrap wells rather than
nested tables
* Use friendlier dates

Caveats are that the logic for displaying the changes is a little ack n
slash and could do with some love. Most of this comes as result of our
models no longer matching displayed labels.
Move versions logic into helper

* Create methods for friendly title, summary and field names
Update styles for bootstrap 3