Ftw.keywordwidget

------------------

- BREAKING CHANGE: Disallow setting a custom permission at widget init time.
[Rotonen]

- Move the accidentally-persisting permission check from the field to the
widget and cache the result in the request.
[Rotonen]

------------------

- Fix an issue where the term-lookup will fail after the form-validation.
https://github.com/4teamwork/ftw.keywordwidget/issues/27
[elioschmutz]

------------------

- Add event after initializing a widget.
[elioschmutz]

------------------

- Add possiblity to add templates for the select2 widget.
[elioschmutz]

------------------

- Only add terms to the new field list if it's really a new selected term.
[mathias.leimgruber]

------------------

- Fix a bug, which I introduced in 1.3.3 and miss to catch in 1.3.4 :-( [mathias.leimgruber]