Update plugin for PhoneGap/Cordova 3 automatic installation

Plugin can now installed via "phonegap local plugin add"
Added automatic adding of Javascript-Links to <head>

Replaced the simple copying via the <asset> tag by the better <js-module> tag, which also automatically creates links to the js files (in the HTML header) when building. 

http://docs.phonegap.com/en/3.0.0/plugin_ref_spec.md.html
Merge pull request #2 from SidneyS/master

Updated LocalNotification plugin for PhoneGap/Cordova 3 automatic installation