Merge pull request #82 from Cito/develop

Include translations in distribution.
Fix #84 in archive_tw2_resources
Merge pull request #85 from toscawidgets/feature/archive_tw2_resources

Fix #84 in archive_tw2_resources
Add a failing test for #25.
Automatically assign widgets an ID.
Enforce twc.Required (for #25).
Deal with faulout from the twc.Required enforcement.
Merge pull request #87 from toscawidgets/feature/twc.Required

Feature/twc.required