added the ability to set a set of nodes that are not targets for lsyncd
Merge branch 'master' of https://github.com/prometheanfire/rackspace-lsyncd
allow the not-target-server-role attribute to be nil
one character commit, the if was inverse...
Merge pull request #2 from prometheanfire/master

allow a set of nodes to be set to not be targets of lsyncd