[HELIX-270] Include documentation for previous version on the website
[maven-release-plugin] prepare release helix-0.7.0-incubating
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
[HELIX-270] Include documentation for previous version on the website, fix htaccess