------------------
- Fix ``plone.app.contenttypes`` dependency for Plone 5.1
[agitator]
- Improve TinyMCE toolbar sticky computation
[frapell]
- fix .mosaic-width-quarter/.mosaic-width-three-quarters grid CSS to wrap correctly
[petschki]
- refactor mosaic-grid.less imports to avoid duplicated CSS selectors. (453)
[petschki]
- be more specific when removing top-margin
[petschki]
- safely read tile weight from registry
[petschki]
- refactor test-suites and add robot-tests
[petschki]
- Fix pip install command in ``.travis.yml``
[staeff]
- Fix byte-string join in ``main_template.py``
[1letter]
- Bug-fix in robot test
[1letter]