Add a count() method
Add a count() method

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