workaround for gem installation on CentOS 5.5, stop from installing to
v2.0.0
CLOUDIFY-1543: adapting Dan Garton's fix to keep the version in properties

Also, avoided bumping the RubyGems version from 1.8.24 to 1.8.25 until
further testing. In any case, I suggest we switch to using  the same version on
all distros.
Merge pull request #51 from Fewbytes/1543

Fixes [CLOUDIFY-1543](https://cloudifysource.atlassian.net/browse/CLOUDIFY-1543)