Add IAD to set of regions and that it is the default region.
Add IAD to set of regions and that it is the default region.

opsdisk/pyrax,roelvv/pyrax,pratikmallya/pyrax,sivel/pyrax,rackerlabs/heat-pyrax,rackspace/pyrax,0dataloss/pyrax,vikomall/pyrax,ddaeschler/pyrax,naemono/pyrax,EdLeafe/pyrax,briancurtin/pyrax,mandx/pyrax