Create a compressed BASE64 encoded version of the hyperscan database.

[apismensky]

We need to store a hyperscan database so that it can be easily serialized and sent as a part of the payload (json, xml etc).
Ideal solution would be to have it as BASE64 encoded and compressed from the stream, produced by Database's save method.
Compression can reduce DB size in average ~10 times, as we saw in some cases for our DBs, which can be critical for large databases.
Also a corresponding static method to read a serialized DB is needed (BASE64 encode and decompress)
PR: #224

[apismensky]

@gliwka - please take a look and let me know