Update release notes for 0.3.0 release.

Reviewed by: kiyan
[maven-release-plugin] prepare release kiji-express-0.3.0
[maven-release-plugin] prepare for next development iteration
EXP-37. Avro classes not required on classpath for reads.

Avro records from a Kiji table are read into a generic AvroRecord.

Reviewed by: kiyan
EXP-50. Fixes IllegalArgumentException bug in ScriptRunner.

Removes extra ',' added to the config entry "tmpjars".

Reviewed by: kiyan