Add tr callbacks to iterate
Add tr callbacks to iterate

safetychanger/IDBWrapper,mizchi/idb-wrapper-promisify,jayfunk/IDBWrapper,jayfunk/IDBWrapper,rubenstolk/IDBWrapper,kilbot/IDBWrapper,kilbot/IDBWrapper,rubenstolk/IDBWrapper,safetychanger/IDBWrapper,GerHobbelt/IDBWrapper,mizchi/idb-wrapper-promisify,jensarps/IDBWrapper,jensarps/IDBWrapper