Kotti-events

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- Updated packaging.

- Depend on Pillow instead of PIL (Kotti depends on the former).

- Fixed tests for Kotti 0.7

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- Rescale event images if larger than 600x600
- Removed times for past events in event folder
- Changed date format to 'full' and time format to 'short'
- Fixed title in add/edit view for event folders
- Added tests
- Fixed bug concering query of upcoming events

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- Update models to use Declarative for compatibility with Kotti >= 0.6.
- All dates but the start date are now optional for events.
- Added thumbnail and icon views for event pictures.
- Updated layouts and style sheets.

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- Initial release