BlackBerry project template updates

* Updated .cproject to use workspace_loc to enable copying the template out of the cocos2d-x tree.
* Updated bar-descriptor.xml to be more modern. Tested with Tablet OS 2.1.0 and BlackBerry 10 (10.1 and 10.2) SDKs.
* Removed now-unneeded empty file.
Merge pull request #3856 from lewellyn/master

BlackBerry project template updates