Demodulize worker names to have valid StatsD metrics.

When having workers inside namespaces the "::" in the worker name will create
invalid metric names.

The following was found on our statsd logs:

DEBUG: Bad line:  in msg "production.worker.Cassandra::NotificationMapWorker.success:1|c|@0.1"
Merge branch 'nhocki-demodulize_worker_names'
Bump version to 0.1.4
Fix for old versions (i.e. 2.6.0)
Add option to remove global sidekiq_stats

Sidekiq needs to go through all the queues to get some of the stats being reported
on the sidekiq stats (like the `enqueued`), when you have *a lot* of jobs per second
and a lot of queues this adds way too much load on Redis and kills it.

This adds an option to prevent these global metrics from being reported.
Add doc for sidekiq_stats option
Merge branch 'nhocki-remove_global_counts'