Ftw.keywordwidget

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- Nothing changed yet.

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- Fix invalid initialization, for example on PAM views. [mathias.leimgruber]

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- Make sure the custom focus event does not get triggered on non keywordwifget select2 fields. [mathias.leimgruber]

- Move Plone 5 upgrade step to the correct folder so it's picked up by ftw.upgrade [Nachtalb]

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- Stop generating sourcemaps for JavaScript (which isn't working with Plone). [djowett-ftw]
- Fix empty select2 widget when initialised too early [Nachtalb]

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- Fix Plone5 JS initialization + Fix loading keywordwidget on tab change. [mathias.leimgruber]

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- Fix product to work on Plone5 in production (resolves 46) [djowett-ftw]
- Fix on click event for edit form tabs (resolves 42) [djowett-ftw]