* upstream/develop:
  make use of phpunit 6.5 for PHP 5.6.
  fix failing test for group removal confirmation message.
  Add props for CMB2#1208
  Move the remove_confirm option to the example functions and leave default empty (to not break back-compat)
  Oops, fix typeof yoda check
  Fix removal confirmation in tests
  Simplify removal confirmation check
  Update typeof checks to use yoda
  make remove confirmation a bit more succinct
  Cannot use empty on an operation on older versions of php
  see CMB2#529 - improvements as per PR review:
  see CMB2#529 - fix tests with a default confirm value in DOM equal to no.
  fix CMB2#529 - Add confirm dialog to group Remove button.
  Add props for CMB2#1206
  Add php tests npm script
  Add grunt watch npm script
  Add props for CMB2#1204
  Ignore composer vendor dir
  fix CMB2#1205 - Package.json: fix the need of global (old) grunt.
  fix 1023 - Update PHPUnit version in composer.json.
  Add props for CMB2#1200
  Remove superfluous method definitions
  Add develop class suffix to init.php class
  Bump version for hotfix release
  Fix issue when wp.data does not have core/editor. Check it first. Fixes CMB2#1197
  Update version to 2.5.0
  Update changelog
  Make install-wp-tests.sh executable
  Update tests to pass
  Add cmb_init_pickers and cmb_init_code_editors events for allowing just-in-time configuration for pickers/editors
  Make CMB2.getFields/CMB2.getFields more robust, allowing a filter callback, and specifying by field id