default to cassandra 1.2, and use cql3 transport methods automatically

also, don't execute USE in initialize; the after connect callback will
do that; it would start a cql query before it knew which version
to speak

third, fix quoting for cassandra 1.1

finally, DateType was renamed to TimestampType, so alias the
cast class
Merge pull request #61 from ccutrer/autocql3

default to cassandra 1.2, and use cql3 transport methods automatically