Updated the plugin and example to Cordova 2.3
Added windows phone 8 example app
Implemented Windows Phone 8 backend

- Updated the WP8 example build process to use a pre-build step that
copies the plugin code and index file to the location required by the
WP8 app.

- Updated the example README.md
Updated iOS example.

- Moved the iOS cordova-2.3.0.js file to the ios/www directory.
- Changed the iOS pre-build step to copy the example www code and JS plugins to
  the new ios/www directory.
- Changed the Xcode project to include the new ios/www directory as a reference
  directory.
Fixed AutoHideSplashScreen bug in iOS backend.

- Updated to read the AutoHideSplashScreen setting from the cordova settings
  (i.e. config.xml) instead of from the Cordova.plist (which no longer exists
  when using Cordova 2.3.0).
Updated example to use sample input text if window.prompt method is not
available.
Merge pull request #4 from wcwynn/v2.3

Updated the plugin and example to Cordova 2.3