* Started the implementation of Maxmind GeoLocationProvider and modified the IGeoLocationProvider API.
 * Fixed regression into the main ViewPart which caused the pray times not be updated/refreshed when changing the city.
 * New plugin created from existing jar (net.javazoom.jlayer)
 * Added extension-point which adds the possibility provide a sound player.
 * Added WAV and MP3 sound players.
 * Updated plugin.properties of some plugins.
 * Added "Eclipse-BundleShape = dir" to the MANIFEST.MF of 'WaqtSalat Preference' plugin in order to unpack the plugin during installation.
 * Updated WaqtSalatPreferenceConstants so that it returns the default adhan file.
 * Updated main ViewPart (alerts support)
 * Removed exported packages from the UI plugin (no package needs to be exported).
 * Modified core model (added 'playingAdhan' and 'adhanPlayer' attributes) in order to ease the play/stop of adhans into the UI.
 * Regenerated the core model classes.
 * Added 'getUpdatedPraysTimes' method into PrayTimeHelper in order to retrieve the new pray times without changing the references of the pray times contained into the first collection.
 * Updated label provider of pray table viewer in order to show a stop button when an adhan is being played.
 * Added new action (which is also added to the view's toolbar) which stop the playing of an adhan
 * Updated main ViewPart.
 * Changed default prefrence value of timezone settings from 'use system timezone' to 'get timezone from city'.
 * Fixed bug into Alert Preference page which blocked page change due to validation error when 'custom adhan' is set.