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
Added optional async to Autocomplete Datasource
Also updated the example and created a manager
to demonstrate the pattern.
nil guarding.
Merge branch 'pr_async' of github.com:kav/HTAutocompleteTextField into pr_async

Conflicts:
	HTTextFieldAutocompletionExample/HTAutocompleteTextField.m