Bump ruby version to 2.1.2

This is currently running an old version of 1.9.3, so we should update.
Merge pull request #50 from alphagov/bump_ruby

Bump ruby version to 2.1.2
Quote curl commands containing special characters

Ampersands and/or question marks do funny things in bash, so wrap
these commands in double quotes.
Merge pull request #51 from alphagov/readme-curl-quotes

Quote curl commands containing special characters
[Perf Plat] Remove Limelight routes

These routes are now served by the regular /performance application,
so we no longer need this exception.
Merge pull request #52 from alphagov/remove-licensing-limelight

[Perf Plat] Remove Limelight routes