* 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).
It is now possible to add bendpoints to flows or drag bendpoints to
update their position / trigger reconnects.
Upon bendpoint move a rule is checked to figure out whether or not a
bendpoint operation is allowed or not.
Closes#123Closes#138Closes#139Closes#165