Update build to 1,2.0

Author: MatthijsBurgh

build/roslib.js

@@ -2490,7 +2490,7 @@ module.exports = function (fn, options) {
  * If you use nodejs, this is the variable you get when you require('roslib')
  */
 var ROSLIB = this.ROSLIB || {
-  REVISION : '1.1.0'
+  REVISION : '1.2.0'
 };
 
 var assign = require('object-assign');