Simplelayout.ui.base

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- Drop Plone 4.1 support. [jone]

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- Only enable simplelayout block edit actions, if documentEditable class is available.
[mathias.leimgruber]

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- Trigger 'refreshed' event after colorbox initialization
[elioschmutz]

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- Ajax requests made by ajaxManager should be POST, not GET.
This solves several caching Issues with latest IE11 and Chrome > 41.
[mathias.leimgruber]

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- Make it possible to disable colorbox on sl images.
[lknoepfel]

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- Add missing semicolon in sl_ui_variables.js.
[mathias.leimgruber]