CHOP-8. (P3) DSL Scaladoc and other revisions.

Reviewed by: robertchu
CHOP-8. (P4) KijiInputFormat Scaladoc improvements.

Reviewed by: robertchu
CHOP-8. (P5) KijiKey Scaladoc improvements.

Reviewed by: robertchu
CHOP-25. Adds ability to run uncompiled chopsticks scripts.

See org.kiji.chopsticks.ScriptRunner for the implementation.