Change meaning of logging settings to "supress logging"

this closes #21

	modified:   res/xml/logging_preferences.xml
	modified:   res/xml/preference_headers.xml
	modified:   src/de/unierlangen/like/NavigationApplication.java
Working on new map and it's scaling

	modified:   AndroidManifest.xml
	modified:   src/de/unierlangen/like/customviews/MapView.java

	new file:   res/drawable/map_small.jpg
Added a new now real pretty map

	modified:   res/drawable/map_small.jpg
	modified:   src/de/unierlangen/like/customviews/MapView.java
fix log
Add drawMapOverlay preference

	modified:   res/xml/preference_headers.xml
	modified:   src/de/unierlangen/like/customviews/MapView.java
	modified:   src/de/unierlangen/like/ui/MainYourLocationActivity.java

	modified:   src/de/unierlangen/like/ui/MainYourLocationActivity.java

Conflicts:

	res/xml/preference_headers.xml
Merge branch 'new_map' into develop