update jobs machineTypes to add region, change property clusterName to cluster, remove clusterType

Author: sanfilip

lib/jobs/machineTypes.js

@@ -9,14 +9,16 @@ var assign = require('lodash.assign');
  * @description Return a list of available cluster machine types. If the isBusy property is true then all machines of the specified type and cluster are currently running jobs.
  * The machineTypes method takes an optional first argument to limit the returned cluster machine type objects.
  * @param {object} [filter] - An optional filter object to limit the returned job objects
- * @param {string} [filter.clusterName] - Optional cluster name to match on
+ * @param {string} [filter.region] - Optional region to match on
+ * @param {string} [filter.cluster] - Optional cluster to match on
  * @param {string} [filter.machineType] - Optional machine type to macth on
  * @param {boolean} [filter.isBusy] - Optional busy status value to match on
  * @param {function} cb - Node-style error-first callback function
  * @returns {array} [ clusterMachineType, ... ] - JSON array of available cluster machine type objects
  * @example
  * paperspace.jobs.machineTypes({
- *   // clusterName: 'PS Jobs', // optional filter on cluster name
+ *   // region: 'East Coast (NY2)', // optional filter on region
+ *   // cluster: 'PS Jobs', // optional filter on cluster
  *   // machineType: 'P5000', // optional filter on machine type 	
  *   // isBusy: false, // optional filter on busy status 	
  * }, function(err, res) {
@@ -34,26 +36,26 @@ var assign = require('lodash.assign');
  * //Example return value:
  * [
  *   {
- *     "clusterType": "Jobs Cluster",
- *     "clusterName": "PS Jobs",
+ *     "region": "East Coast (NY2)",
+ *     "cluster": "PS Jobs",
  *     "machineType": "P5000",
  *     "isBusy": false,
  *   },
  *   {
- *     "clusterType": "Jobs Cluster",
- *     "clusterName": "PS Jobs",
+ *     "region": "East Coast (NY2)",
+ *     "cluster": "PS Jobs",
  *     "machineType": "V100",
  *     "isBusy": false,
  *   },
  *   {
- *     "clusterType": "Jobs Cluster",
- *     "clusterName": "PS Jobs on GCP",
+ *     "region": "GCP West",
+ *     "cluster": "PS Jobs on GCP",
  *     "machineType": "K80",
  *     "isBusy": false,
  *   },
  *   {
- *     "clusterType": "Jobs Cluster",
- *     "clusterName": "PS Jobs on GCP",
+ *     "region": "GCP West",
+ *     "cluster": "PS Jobs on GCP",
  *     "machineType": "P100",
  *     "isBusy": false,
  *   }