Release 1.2.0

We have a major feature of Events framework and several improvements and bugfixes. It would be nice to have a release, the last one was half a year ago.

Here's complete list of changes:
https://github.com/seancribbs/webmachine-ruby/compare/bfd357e7a471f557db3c321a812ba79293569b22...master

I've already prepared initial changelog. What do you think?