Silencing Cassandra output when its starting up

This fixes an issue where all of Cassandra's logging went to stdout.

The logs are available in /var/log/cassandra/system.log so what's written to stdout is not necessary to redirect anywhere else.
Merge pull request #138 from iconara/cassandra_init_fix

Silencing Cassandra output when its starting up
Merge branch 'master' into bluebox