matchure 0.13.0-SNAPSHOT for clojure 1.5

Hi Drew, 

here it is:
- version up'd to 0.13.0-SNAPSHOT
- compiled and tested against Clojure 1.5.1
- big number types (M suffix) do not match anymore against other numeric
types 
- the main namespace is now matchure.core
- mods and formatting in read-me.md
- NOT pushed to clojars, please tell me when you do, so I can upgrade too.

Take your time and don't hesitate to cut into it... 
Thanks again for this awesome lib!

François