ENYO-2950: Ares cannot change file name's letter case if file system is not case sensitive. 

* Tested on OSX/Chromium 29.0.154.

* Test Case
Ares can change the file name "App.js" to "app.js" which is located at app/source/.

* Jira:
https://enyojs.atlassian.net/browse/ENYO-2950

Enyo-DCO-1.1-Signed-off-by: Junil Kim <logyourself@gmail.com>