Merge branch 'release/2.1.5' into develop
Support more webob versions.  Fixes #77
Constrain webtest version for py2.5.
Port to python2/python3 codebase.
Travis-CI config update.
Some py3 fixes for tw2.forms.
@moschlar on the ball.
Some setup for a port of tw2.devtools to gearbox.
Merge branch 'feature/2.2' into develop
Mention tw2.core.DirLink in the docs.  Fixes #69.
Reference gearbox tw2.browser in the docs.

Relates to #81.
Include translations in distribution.
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