Change data blob to email text.
Change data blob to email text.

Didn't need anythign else that might have been in the blob. This
is simpler and now emails are visible in cqlsh, which helps.

tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review,tobert/cassandra-summit-cfp-review