Adding LWRP for ganglia-logtailer

I want to note that this recipe / LWRP requires building and making available the ganglia-logtailer package (the source of which is available in the ganglia_contrib repo). The package is not currently available in the standard debian or redhat repositories. I put this caveat both in the README and in the recipe itself, so though the recipe doesn't 'Just Work' (which is normally my standard for inclusion in a public cookbook), hopefully it's easy enough. 
Please comment if you think this is OK or if the PR should be abandoned because of this flaw.