Support Cassandra 3.0

[mojotalantikite]

gocql has support for cassandra 3.0.0 if you set the protocol version with something like this:

cluster := gocql.NewCluster(hosts)
cluster.ProtoVersion = 4
cluster.CreateSession()

I started testing in a fork, but the build process is having issues with the change in how 6g is built in go1.5 (via go tool compile). I'll dig into that sometime tonight when I have time.

[gravis]

You can pass the procol version in the connection url: https://github.com/mattes/migrate/pull/58/files#diff-9bd872a7e998beab5c90a6af886148cbR46
refs #58

[mojotalantikite]

I've been using my forked version since I opened this and forgot about it, but it looks like #89 adds this support via the connection url.

I just tested with the merged changes and everything is working fine for me on Cassandra 3.2+. I think we should be good to close this out.