Implement tag detected and tag lost signals

This patch also implements reading the record pathes from the tag.

Change-Id: Ia19ff235149cb91d3cbf7ae7c043d07d6aeae429
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Add neard ndef record parsing

This patch adds the neard dbus interface and provides logic
to parse data from this interface.

Change-Id: Id9a5df88d75c71cf6f2b320afed644a38d03c38d
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>