Betahaus.viewcomponent

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- Added: Option to return dict, generator or list instead of just joined strings.
- Added: Spacer option for the join statement.
- Added: A config directive ''add_view_action'' to att view actions without scanning.
- Fixed instance when replacing a ViewAction caused the new action to be displayed twice.
- Bugfix: When replacing, the order should be preserved unless priority is set.
- Removed debug panel since the code was outdated and didn't work with
the newer version of pyramid_debugtoolbar

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- Unicode wasn't an allowed string-type... (Brown paperbag for me) [robinharms]

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- View groups don't catch exceptions any longer. This was a cause of a lot of
odd error messages on Python 2.
- Ordering with bad keys don't cause exceptions - they're logged as warnings instead.
- New argument priority for view actions. [ixmatus]

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- Python3 support fixed by pib (Paul Bonser) - thanks a lot!
- Fetch and execution of vas changed - empty result should be ignored,
and yield isn't used now. This should make error messages clearer. [robinharms]
- Checks for containment, interface, permission etc moved to ViewAction object, since
they weren't performed if the object was called directly. [robinharms]

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- Initial version