Ftw-workspace

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- The preview image should not be bigger than the container.
[Julian Infanger]

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- Group previews by modification date.
[mathias.leimgruber]

- Implement image preview for ftw.file.
[mathias.leimgruber]

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- Fix bad href in overview_sublisting.
[elioschmutz]

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- Implement a generic listing on the workspace overview tab.
[mathias.leimgruber]

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- Use human date formatting with "today", "yesterday" etc.
for tabs "documents", "events" and "workspaces".
[jone]

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- Add div-element arount ics export for better css selectors
[elio.schmutz]

- Provide a workspace browserlayer.
[mathias.leimgruber]

- Make auto-roles, granted to the owner of a workspace, configurable.
[jone]

- Plone 4.3 compatibility.
[jone]

- Move the following features from a private repo to ftw.workspace.

- Enable filtering on overview.
- Truncate long text in recently modified listing.
- Use 'today + time' and 'yesterday + time' in recently modified listing.

[mathias.leimgruber]

- Add permissionmapping for ftw.lawgiver
[elioschmutz]