Assorted enhancements #3
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This is a 3-(or 4)-part PR, if you prefer that I create separate PRs please let me know.
rackgem (version >= 3 extractedrack/handlerinto the separaterackupgem). Also replaces the obsolete Polteregeist Capybara driver with the more modern Cuprite#ignoring_mutationmore useful by allowing nested calls (e.g. inside helper methods), and also allowing to call it without a block to disable/enable waiting for mutations for the rest of the spec