Collective.cover on Plone 5

it has been a long journey and we're almost there:

there are still some broken parts and failing tests; if you have experience with Plone 5, I need your help and/or advice on how to fix the following issues:

we just finished removing the dependency on five.grok (kudos @marr and @rodfersou).

we're currently working on rewriting the calendar tile which introduced a lot of errors because of the calendar_tool removal (this was expected, but it was a customer requirement with a fixed deadline).

@datakurre, @vangheem can you tell me if there are incompatibilities with the new versions of (3.0), (2.1) and plone.tiles (1.6)?