Relesing version 0.9.9

Bugfixes:
* Transaction not aborted in WriteableCollection.modify()
* Sub-transactions bugfix
* DataCloneError in on('populate') didnt abort DB

Optimizations:
* Change of Promise.PSD and Transaction._lock()

Improvements:
* Package.json added (thanks to Patrick Golden)
* More clear error message when db.open failed
* New intuitive use case for db.on('ready')