importUsage imported from vleet (#9)

* importUsage imported from vleet

* catch fix

lib/airvantage.js

@@ -16,7 +16,7 @@ var SYSTEM_LIFECYCLE_OPERATIONS = ["activate", "suspend", "resume", "terminate"]
 
 /**
  * AirVantage API class
- * 
+ *
  * @param {String} setup.serverUrl
  * @param {String} setup.companyUid (optional)
  *  @param  {String} setup.credentials.clientId
@@ -36,14 +36,14 @@ module.exports = AirVantage;
 
 /**
  * Authenticate this instance of AirVantage
- * 
- * @param  {Object} options, 
+ *
+ * @param  {Object} options,
  *         may contain different parameters to perform the authentication:
  *          - token: if you already have an access_token
  *          - username & password: to get authenticate different user
  *              These will override the one you may already have set at
  *              global level.
- * 
+ *
  * @return {Promise} with the token
  */
 AirVantage.prototype.authenticate = function(options) {
@@ -78,11 +78,11 @@ AirVantage.prototype.authenticate = function(options) {
 
 /**
  * Logoout this instance of AirVantage or a given token
- * 
+ *
  * @param  {Object} options
  *           - token: a token to expire instead of the default instance one
- * 
- * @return {Promise} 
+ *
+ * @return {Promise}
  */
 AirVantage.prototype.logout = function(options) {
     var expireUrl = [this.serverUrl, EXPIRE_TOKEN_URL].join("/");
@@ -194,6 +194,26 @@ _.each(SYSTEM_LIFECYCLE_OPERATIONS, function(operationName) {
             })
     };
 });
+
+
+AirVantage.prototype.importUsage = function(data) {
+    var resource = [this.serverUrl, BASE_API_URL, "operations/systems/usages/import"].join("/");
+
+    return got(resource, {
+            query: this._buildQuery(),
+            headers: _.extend(this._buildHeaders(), {
+                "Content-Type": "application/octet-stream"
+            }),
+            json: true,
+            body: data
+        })
+        .then(function(res) {
+            return res.body;
+        }).catch(function(error) {
+            console.error(error.response.body);
+        });
+};
+
 //////////////////////////////////////////
 //     OPERATOR CONNECTIONS             //
 //////////////////////////////////////////