rubydora depends on mime-types >= 0

[halostatue]

I'm preparing mime-types 2.0 for release, and it has some breaking API changes (not for most uses, but some esoteric features). The most important API change is that mime-types 2.0 no longer supports Ruby 1.8.

If this matters, the gemspec needs to be changed from >= 0 to ~> 1.16.

This was originally reported to samvera/active_fedora#251.

[cbeer]

Thanks for the heads-up. I'm not sure we need an explicit dependency on mime-types anyway. I think the transitive dependency from https://github.com/rest-client/rest-client is good enough. I'll remove that in #41.