Dysbiosis index

Addition of the microbial dysbiosis index described in [Gevers et al 2014](http://www.ncbi.nlm.nih.gov/pubmed/24629344). This method has been generalized to support other indices in the future as well.

@ElDeveloper, can you review please since you implemented the original approach? 
 No need to change it but ... dec 19 2012? ... do you have a delorean parked @ JSCBB? And more importantly, can I borrow it? :smiley: