Merge pull request #4 from joevandyk/rvm-gemset

Create the ruby-duration gemset if it doesn't exist.
Merge pull request #6 from joevandyk/master

Remove whitespace
Updated Mongoid serialiser for Mongoid >= 3.x
Changed from gemcutter to https://rubygems.org
Bumped Version to 3.0.0
Updated Documentation
Changed 'mongoid' gem version to 3
Merge pull request #9 from wintersolutions/remove-gemcutter

Changed from gemcutter to https://rubygems.org
Fixed: Mongoid needs Ruby >= 1.9.3
Merge pull request #10 from wintersolutions/mongoid-3

Support Mongoid 3
Test against ruby 2.0 in travis-ci
Require minitest/autorun instead of minitest/spec
Use Minitest.autorun instead of Minitest::Unit.autorun
Merge pull request #12 from sanemat/fix/minitest-warning

Fix minitest warning
Merge pull request #11 from sanemat/feature/ruby-2-0

Test against ruby 2.0 in travis-ci
Add ability to parse iso8601 durations.

I'm not an ISO8601 expert, but it appears many implementations ignore
weeks in the format string. The Ruby iso8601 library does, and
postgresql does as well:

select interval '1w';
interval
----------
P7D

In order to better operate with those libraries, this library no longer
includes the week in the iso8601 format.