Allow user to pass "namespace" argument to ConfigurationClient.list method and
add overloaded method which doesn't take namespace argument.
Add overloaded "list" method to the ServicesClient which doesn't takt tag
argument.
Add missing else clasue.
Use startsWith and endsWith.
Get rid of uneccessary else clause.
Bump version.
Merge pull request #14 from racker/configuration_namespaces_support

Configuration namespaces support