Update dependency versions for release.
[maven-release-plugin] prepare release kiji-express-0.7.0
[maven-release-plugin] prepare for next development iteration
EXP-176. Stops clobbering mapred.child.java.opts in express script.

This commit modifies the express script so that it does not overwrite
mapred.child.java.opts when launching jobs. This was being done to
disable schema validation. Now, KijiJob is modified to append to
mapred.child.java.opts to accomplish this.

Reviewed by: chris