using/testing on ruby 1.9

[craiggenner]

To get this to usable and run the tests I had to add the following:

spec.add_development_dependency 'mime-types', '~> 2.6.2'

to fog-aws.gemspec

What do people think of adding this? It might also be the fix for ruby 1.8, but I haven't tested yet.

[geemus]

Yeah, I think we need to lock to < 3 anyway. That said, we probably need to do it in fog-core instead (so that it will be true for all the fog sub-libraries. I'll look at doing it over there shortly.