Switch to bytes for key/value (#13)

Allow key to be any type (#12)

* Allow key to be any type

* Add key parsing to unit tests and remove Backup

* Update README.md and example to use a more complex key

KeyValue struct with empty interface Value (#11)

Optimize for low memory usage (#10)

* Default loading modes to FileIO

* Share low memory optimized DB options

Add CreateBackup for creating a backup from a directory (#7)

Generalize exported WriteStream vs WriteStdin (#6)

Initial code commit (#3)