Cleanup: implement cf_runtimes_* methods in terms of #cf_runtimes.
Add a new cf_dea_runtimes method that returns all runtimes in use on all the DEAs in the current CF cluster.
Bump copyright.
Bump version to 1.1.0 since we introduced a new API.
Ensure the correct group ownership for the checkout directory.
Provide a default empty attribute for runtimes to match related helpers.
Release 1.1.1: minor bug fixes.