Use RSpec 3.0

- Update Gemspec
- Update Gemfile.lock
Update Specs for 3.0

Update Patron Spec for 3.0
Update Resource Group Spec for 3.0
Update Resource Spec for 3.0
Update Marc Bib Spec for 3.0
Update data objects & steps for 3.0

Update data objects and Cucumber step definitions
for use with RSpec 3.0

- User steps
- Patron
- Resource
Merge RSpec 3.0 compatibility branch
Update Changelog