rename tuple functions
moved prepfn (which is Cascading specific) into the cascading namespace
Merge pull request #9 from bhiles/move-prepfn

moved prepfn (which is Cascading specific) into the cascading namespace
Merge pull request #10 from bhiles/small-cleanup

rename tuple functions
Merge branch 'bsh-clojure-engine' into small-cleanup-2

Conflicts:
	cascalog-core/src/clj/cascalog/in_memory/platform.clj