Get ready for rails4.

Stop using features which are deprecated or removed in rails4.
last is better than to_a.last
Default partitioning strategy of round_robin.

Resolves #1
Merge pull request #8 from square/default-round-robin

Default partitioning strategy of round_robin.
Get rid of special sort for "web".

The pages /projects currently sorts a project named "web" at the top. Not only is this a Square-ism,
but I doubt it even makes sense for Square these days.
Merge pull request #9 from square/jkingdon/no-special-sort-for-web

Get rid of special sort for "web".
Merge pull request #2 from square/jkingdon/rails4-readiness

Get ready for rails4.
Merge remote-tracking branch 'square/master'