Capture all major breaking changes
List some minor breaking changes as well
List major non-breaking improvements
Uppercase for consistency
Don't use bullets for single items, fix C string section
Add TOC
Copy the introductory text from #618
Condense -bindTo: example a bit
Minor proofing
RACSubscriber can be replaced with id<RACSubscriber> too
Merge pull request #682 from ReactiveCocoa/add-changelog

Add changelog for 2.0