add sinks to the In-Memory platform
Merge branch 'bsh-clojure-engine' into add-sinks

Conflicts:
	cascalog-core/src/clj/cascalog/in_memory/platform.clj
Merge branch 'bsh-clojure-engine' into add-sinks
In-Memory testing should use sinks
Merge pull request #13 from bhiles/add-sinks

add sinks to the In-Memory platform