add UIControlEventEditingChanged event

for ReactiveCocoa rac_textSignal Support
Minor Cleanup
-Removed duplicate project entries
-Removed unused property
-switched init to instancetype
Merge pull request #32 from ryuheechul/patch-1

add UIControlEventEditingChanged event
Merge pull request #33 from kav/pr_cleanup

Minor Cleanup
Insert Mode
Moved the responsibility for trimming a partial
match to the autocomplete control.

(this and async are prerequisites for web lookup
addresses which is coming next)
Added optional (missed that line when untangling).
Merge branch 'pr_insert' of github.com:kav/HTAutocompleteTextField into pr_insert