Collective.eeafaceted.z3ctable

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- Made BrowserViewCallColumn more generic, use unrestrictedTraverse instead of getMultiAdapter
[sgeulette, gbastien]
- Added DxWidgetRenderColumn to render a dexterity field widget
[sgeulette]
- Added RelationTitleColumn to render a z3c.relationfield.relation.RelationValue attribute
[sgeulette]

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- Splitted the 2 viewlet managers to be able to add viewlets above and below batch navigation,
henceforth we have 4 viewlet managers : 'collective.eeafaceted.z3ctable.topabovenav',
'collective.eeafaceted.z3ctable.topbelownav', 'collective.eeafaceted.z3ctable.bottomabovenav',
'collective.eeafaceted.z3ctable.bottombelownav'.
[gbastien]

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- Use HTML entities &9650; and &9660; instead of ▴ and ▾
so it behaves nicely in both Firefox and Chrome.
[gbastien]

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- Define a default CSS class on each TD as it is already done for TH
so it is easy to skin if necessary.
[gbastien]

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- Replace sort triangle characters by html entities.
[sgeulette]
- Don't pin setuptools for travis.
[sgeulette]

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- Set long_format=True for CreationDateColumn and ModificationDateColumn.
[gbastien]
- VocabularyColumn: get term by value and not by token.
[sgeulette]