Collective.messagesviewlet

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- Increased coverage by using vocabulary methods instead of redefining it in tests.
[gbastien]
- Added new example message: bad browser (not Firefox) warning
[sgeulette]
- Use plone.formwidget.datetime to have hour at 0 by default.
[sgeulette]
- CSS fix : display 'cursor: pointer;' when hovering the close button.
[gbastien]
- Added 'MessagesConfig' to site_properties.types_not_searched.
[gbastien]

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- Added parameter 'activate' to utils.add_message that makes it possible to create
an 'activated' message directly.
[gbastien]
- Adapted tests to use utils.add_message instead of duplicating this code.
[gbastien]

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- Do not pass a default 'context' in utils._ to avoid strange ConnectionStateError.
[gbastien]
- Give context to translate method.
[sgeulette]
- Corrected and added icon type images.
[sgeulette]

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- Simplify workflow. Only one activated state. Unrestricted search results before filtering.
Added 'use local role' boolean attribute.
[sgeulette]
- Updated default messages
[sgeulette]
- Added local roles test
[sgeulette]
- Renamed bad transition name
[sgeulette]

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- Removed useless dependency on z3c.jbot.
[gbastien]
- Corrected rst in readme.
[sgeulette]

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- Use full url for readme images to display correctly on pypi.
[sgeulette]