Initial libev examples run thru autopep8

These examples are libev specific. They can be run separately and/or together. There can be multiple workers of any type. Using a local single-node Cassandra on my Mac, it's not particularly fast, storing ~1000 msgs/sec. On a real non-local cluster with the usual 6 or more nodes it can go very much faster.

I'll work on an overview but would appreciate comments.

I autopep8'd the files with --aggressive x 2.