get rid of most get_string_* calls as they are removed in 0.7
get rid of most get_string_* calls as they are removed in 0.7

cassandra-rb/cassandra,stipple/cassandra_new,stipple/cassandra_new,cassandra-rb/cassandra,rightscale/cassandra,stipple/cassandra_new,cassandra-rb/cassandra,stipple/cassandra_new,rightscale/cassandra,rightscale/cassandra,cassandra-rb/cassandra