Merge pull request #101 from rjc123/master

New mappings
Escape commas in urls in whitehall mappings file

Some urls in whitehall mappings contain commas. Although a comma is a
valid character in a url path[1] the commas cause problems with the rest
of the munge/redirector processing pipeline.

[1] http://tools.ietf.org/html/rfc3986#section-3.3
Merge pull request #102 from alphagov/escape-commas-in-whitehall-mappings-urls

Escape commas in urls in whitehall mappings file
Lower case 'csv'

Linux filesystems are case sensitive. Mac is not.
Bugfix for ruby 1.9.2

I think this behaviour must have changed from ruby 1.9.2