prepped v0.9 for upload to maven central
added plugins for javadoc, sources, and signing
added Version.java providing programmatic access to binaries version, prepped pom.xml for upload to sonatype

Signed-off-by: gburgett <gordon.burgett@gmail.com>
updated POM to specify correct plugin versions, prepared for 0.9 snapshot release

Signed-off-by: gburgett <gordon.burgett@gmail.com>
added release scripts to perform release builds

Signed-off-by: gburgett <gordon.burgett@gmail.com>
tweaks to release script
Merge branch 'QA' into release
[release] Prepared release version 0.9