Basic geofencing.

# Please enter the commit message for your changes. Lines starting
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# On branch dev
# Changes to be committed:
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#	new file:   res/layout/geofence_dialog.xml
#	modified:   res/values/strings.xml
#	modified:   res/xml/preferences.xml
#	new file:   src/org/mozilla/mozstumbler/preferences/GeoFencePref.java
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#	.idea/
#	MozStumbler.iml
#	local.properties
#	output