only set MONGO_URL from VCAP_SERVICES if variable isn't already set
only set MONGO_URL from VCAP_SERVICES if variable isn't already set
JProgrammer/cf-meteor-buildpack,sarathspillai/cf-meteor-buildpack-bluemix,sarathspillai/meteor-buildpack,cloudfoundry-community/cf-meteor-buildpack,mekhyl/cf-meteor-buildpack,jsloyer/cf-meteor-buildpack,ckandag/cf-meteor-buildpack-2,frannunezrivera/cf-meteor-buildpack