Add array-ordering Rspec matcher.

Copied from https://gist.github.com/bunnymatic/5726011
Add features for result table sorting.

This requires a change in the class names used for results tables.
Move DataTables CSS fixes to central file.

It is not an issue present only on Events-related pages, so it should be
central.
Apply class name change to views

Filtering tests now pass.
Change the color of table highlight.

The color is from Travis CI's build history table and is a bit more
noticeable.