Fix for issue #204, added width option to the CLI. Default value for width is 1200.

Added logger using es6 syntax

src/diagrams/flowchart/dagre-d3.js

@@ -1,5 +1,7 @@
 /* global window */
-var log = require('../../logger').create();
+import * as Logger from '../../logger';
+var log = new Logger.Log();
+
 var dagreD3;
 //log.debug('setting up dagre-d3');
 if (require) {