Fix improper cast of <row_count> from int64 (on some systems) to int32
Merge pull request #13 from ChannelMeter/null-values-fix

Fix improper cast of <row_count> from int64 (on some systems) to int32
streadway/simpleuuid instead of own uuid library

The above mentioned UUID library has a nicer API, is better tested and
is more versatile.
I think it makes sense to not re-invent the wheel here (even it is easy).