Add indexes prop to prototype
Add indexes prop to prototype

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