Switch to binary instead of text protocol on PostgreSQL

[mauricio]

The text protocol becomes really verbose when dealing with binary data, we need to switch to the binary protocol.

[hsyed]

I wouldn't mind getting involved if you wouldn't mind getting me started :)

[mauricio]

@hsyed biggest issue is that there are no docs at the PostgreSQL website about this, you have to read their driver's source code :(

[mauricio]

Also, the two classes that register the encoders/decoders are PostgreSQLColumnEncoderRegistry and PostgreSQLColumnDecoderRegistry so you'd have to change the returned types on them.

All column encoder/decoders would have to change to handle the binary format.