add release notes
Merge pull request #36 from racehub/feature/release_notes

Add Release Notes, more tests
Don't be an ass
Correct change log
2.3.0
2.3.1
Back to dev version
Test against Clojure 1.7
2.3.1 is out
Correct change log
Clojure 1.7.0-alpha2
Bump Leiningen requirement to 2.5.0
Test against Clojure 1.7.0-alpha3
Test against Clojure 1.7.0-alpha4