Adding line about identity_type
Adding line about identity_type

Reference discussion over here: https://github.com/rackspace/pyrax/issues/79

Trying from the working branch this time. =)
mandx/pyrax,pratikmallya/pyrax,rackspace/pyrax,naemono/pyrax,ddaeschler/pyrax,0dataloss/pyrax,rackerlabs/heat-pyrax,sivel/pyrax,opsdisk/pyrax,briancurtin/pyrax,roelvv/pyrax,EdLeafe/pyrax,vikomall/pyrax