ENYO-2388: allow editor's "Save As" action to point on the old named file node in the file chooser popup

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-2388

* With the new feature of the fileChooser, it is possible for the "Save As" action of the editor to point now to the old named file in the FileChooser popup and that, especially, in the filetree of its related project.
* Last FileChooser improvements allow to create folders and write new file name in this case
* Continuous improvement:
 * JSHint rules: https://enyojs.atlassian.net/browse/ENYO-2605

Checked on Windows 7 : Chrome

Enyo-DCO-1.1-Signed-off-by: Vincent HERILIER vincent.herilier@hp.com