Update POM version numbers to 5.0.0-beta2
Switch 5.0.0-beta2 version numbers to 5.0.0-RC1
Fix version numbers to be 5.0.0-rc1 instead of 5.0.0-RC1
Merge pull request #828 from melissalinkert/beta2-version-number

Update POM version numbers to 5.0.0-rc1