Fix infinite loop problem in iedit-rect-mode
Also add a new test case
Add overlay priority option
complete iedit-toggle-selection
Remove confusing messages "Locate the fist occurrence"
Fix failed testcases
Merge branch 'victorhge-master' into lewang-master

Conflicts:
	iedit-lib.el
	iedit-rect.el
bring lewang-master inline with victorhge-master