Modified layouts to adapt to display orientation and size
Moved around a few save and restore operations to work with layout changes
Android Back button now goes back in House fragment id history,  Up button closes House fragment
Try to save memory by destroying the whole map view when the Map fragment pauses
Allow showing and hiding the ortophoto overlay in map view
Let user zoom in one level further than data is available (enhance readability)
Fixed potential bug in map view with not anymore initialized member variables in button listeners
Added version number to about activity
Created resolution-dependent bitmaps for About activity to save memory
Added map source links in About activity
Updated Gradle to 1.9 (with Android Studio 0.4.2)