MXS-1300: Add create/destroy commands

Servers, monitors and listeners can now be created and destroyed with
MaxCtrl.

Exported lodash as a part of the common.js module so that commands can use
it to construct objects. If there are enough common uses of this library,
some of the object construction could be moved to the common module.

client/maxctrl/common.js

@@ -11,13 +11,13 @@
  * Public License.
  */
 
-var _ = require('lodash-getpath')
 var request = require('request');
 var colors = require('colors/safe');
 var Table = require('cli-table');
 
 module.exports = function() {
 
+    this._ = require('lodash-getpath')
     // Common options for all commands
     this.program = require('yargs');