kiji-express: EXP-404. Update express version to 1.0.0-SNAPSHOT.

issue: https://jira.kiji.org/browse/EXP-404
review: https://review.kiji.org/r/1572
commit: https://github.com/kijiproject/kiji-express/commit/94e85faa825b4972ccfe419bf3ee167a339d6884