Ftw.tabbedview

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- Add fallback in tabbedview initalization, when passed index of
oneBeforeClick event is incorrect.
[phgross]

- Fix javascript error in IE10 when no default index is defined.
[Kevin Bieri]

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- Remove whitespace around content title.
[deiferni]

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- Move tabbedview specific styles from plonetheme.onegov to this package.
[lknoepfel]

- Fixed initial tab marker (default-tab).
[phgross]

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- Add before-tab slot.
[mathias.leimgruber]

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- JS: Use base URL to build absolute URL for set_default_tab.
[lgraf]

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- Enable D'n'D upload on tabbedview for IE > 9.
[mathias.leimgruber]