Use '--output-path' instead of sym-links

[runspired]

• linking prevents easily producing builds targeting platforms other than cordova
• links have poor support on Windows.
• not linking would enable committing the www folder when releases are tagged, which may differ from dist or other www folders used for other build targets (such as nw.js electron or cef)

[dukex]

+1 @runspired can I send a pull request for it?