(PhoneGap) Documentation and android plugin bug fixes

The settings documentation was a little incomplete, you still need to specify success and failure functions for the calls to succeed.  The code could be modified to make this functions optional, but it seemed easier to update the documentation.

It looks like there was some leftover testing code in the android plugin, hardcoding a few parameters on and setting the package name.

Let me know if you would prefer these as separate pull requests or if anything needs clarification.