fix typeString: faster typing, iOS 6/7 compatibility, .clear() function added
fix typeString: faster typing, iOS 6/7 compatibility, .clear() function added

alexvollmer/tuneup_js,misfitdavidl/tuneup_js,alexvollmer/tuneup_js,songxiang321/ios-monkey,MYOB-Technology/tuneup_js,songxiang321/ios-monkey,Northern01/tuneup_js,Northern01/tuneup_js,misfitdavidl/tuneup_js,MYOB-Technology/tuneup_js