CHOP-30. Fixes bug in writing timestamps in testing framework.

Reviewed by: robertchu
CHOP-8. Revise Scaladocs for KijiTap.

Reviewed by: kiyan

issue: https://jira.kiji.org/browse/CHOP-8
review: https://review.kiji.org/r/193
CHOP-8. Revise Scaladocs for KijiSource.

Reviewed by: kiyan
CHOP-8. Revise Scaladocs for KijiSource.

Reviewed by: kiyan
Rename KijiChopsticks project to KijiExpress.