Revert "deprecated use of NSTimer to check whether user location updated or not, use"

This reverts commit 6607ebbf8781e05a68e82c0f8c802515ad7763b2.
move the annotation's title to UITextField's placeholder
fixed a bug, when user add a  annotation using long press gesture, and drag the annotation to another location, the annotation's subtitle remains address at first location
added UISearchBar to the top of TargetViewController, used to search address
added UISearchBar's delegate to TargetViewController