update JIRA url.
Update README.md
Merge pull request #26 from markhamstra/DebPackaging

Deb packaging
Make UserInfo more efficient, plus more tests.
Merge branch 'master' of github.com:amplab/tachyon
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