Removing unnecessary files.
Adds documentation about the client_retries attribute.
Fixes issue where we incorrectly get a cluster admin client.

Previously the cluster admin client in the library would return an array
if it couldn't connect. Now it will always return a client or false and
fail (if appropriate) if it can't connect with the configured cluster
admin username and password.
Ensure that we don't incorrectly delete the root cluster admin.

Previously we had the potential to delete the root user if the cluster
admin username was empty or not set.
Up the number of default client retries to 20.
v0.1.3: See CHANGELOG.md for changes.