Added instructions for installing qiime-deploy on RHEL/CentOS 6
Merge pull request #30 from dmdu/centos-install-desc

Centos install desc
Updated versions to 1.7.0 and 1.7.0-dev.
Merge pull request #31 from jrrideout/170

Updated versions to 1.7.0 and 1.7.0-dev.