remove jdk requirement in deb packaing.
dep on hadoop-client only.
separate worker's rpc handler and storage server.
Separate worker info usage for master and workers.
Improve worker storage related.
fix tests.
Added deb building profile to pom.xml
Trimmed unnecessary exclusions.
Version to 0.2.1-csd1
[maven-release-plugin] prepare release tachyon-0.2.1-csd-1
[maven-release-plugin] prepare for next development iteration
Version.java bump
[maven-release-plugin] prepare release tachyon-0.2.2-csd-1
[maven-release-plugin] prepare for next development iteration
Synced Version.java