Drop trailing `/` if not using extended param.

- Fixes 301 redirect which strips authentication header, breaking authenticated methods.
Drop trailing `/` if not using extended param.

- Fixes 301 redirect which strips authentication header, breaking authenticated methods.
Update show summary and summaries tests.
Update movie summary and summaries tests.
Add show summary default test.
Prepare version 3.3.1.
Change log for 3.3.1.
Merge branch 'fix-3.3.1'