* use ES6 import / export
* UTILS: export individual utilities
* TESTS: localize TestHelper includes
BREAKING CHANGE:
* all utilities export independent functions
* library sources got ported to ES6. You must now use
a ES module bundler such as Browserify + babelify or
Webpack to consume this library (or parts of it).
This adds the ability to move flow nodes onto existing
sequence flows (similar to the create on flow behavior
implemented with an earlier bpmn-js release).
Closescamunda/camunda-modeler#432