Normalize routes to remove "_" namespace and move fully qualified name to the end of the URI

Currently the route to retrieve a list of actions associated with a given namespace and package is `/namespaces/{namespaceName}/actions/{packageName}/`. This is confusingly similar to the route for retrieving an action `/namespaces/{namespaceName}/actions/{actionName}`. I propose that the route for getting a list of actions associated with a package be changed to `/namespaces/{namespaceName}/packages/{packageName}/actions` to avoid this confusion and adhere more strictly to restful principles.