IS8601 Date Formats

[bogardon]

See Issue #193

[clayallsopp]

Awesome! Could you also add some tests? Similar to what's already in time_spec.rb

[bogardon]

@clayallsopp I cloned the repo. Created a gemset. Ran bundle. Ran rake spec. It's failing for me here:

.retina?
- delegates to BubbleWrap::Screen.retina?Objective-C stub for message `respondsToSelector:' type `c@::' not precompiled. Make sure you properly link with the framework or library that defines this message.

Was there something else I had to do? I'm not sure if it's because im on Xcode5, OS X 10.9, RM 2.2 or what...

Edit: Seems I had to add app.deployment_target = '6.0' to the Rakefile, which makes sense.

[clayallsopp]

Awesome, thanks!