cancelling boundary edit will also remove tap gesture recognizer
when editing boundary for a field, other field boundaries are visible but greyed; other field centers are different color and have no label
select on a field annotation will select its bounds
updated button icons
field annotation can be selected to delete the field
can redraw a field's boundary by clicking on field center
does not add annotations on each boundary click
Merge pull request #11 from mitrenegade/boundaryEdit

Boundary edit