[maven-release-plugin] prepare release kiji-express-0.8.0
[maven-release-plugin] prepare for next development iteration
EXP-186. Update Scalding version used by KijiExpress.

issue: https://jira.kiji.org/browse/EXP-186
review: https://review.kiji.org/r/984
Update RELEASE_NOTES.txt for release.
[maven-release-plugin] prepare release kiji-express-0.8.1
[maven-release-plugin] prepare for next development iteration
EXP-172. Allow users to read SpecificRecords in KijiExpress

issue: https://jira.kiji.org/browse/EXP-172
review: https://review.kiji.org/r/987
POM-9. Upgrade to Avro 1.7.5

issue: https://jira.kiji.org/browse/POM-9
review: https://review.kiji.org/r/1002
EXP-189. Add a cleanup method to the score producer.

There are tables and resources that are opened during the setup of the producer
but not closed hence throwing exceptions in the finalizer if the producer is in
a long running process. This adds a cleanup method to close and release
resources.

Reviewer: robert
Validate phase combination.
Initial framework for model runner.
Model runner.
Some refactoring
More runner
More util functions
inputspec complete
Remove extractors for prepare and train
First pass over executor
Tests done.