Overwriting executeStepsChain() to dispatch before and after step events between chained steps
Adding method to use our own Syn version
Importing original Syn library

From commit fb7437dc4c5aadb352bff84633e230ef965ac60e
Including Andrew's fix to Syn repositioning and minified version

https://github.com/andrewnicols/syn/commit/56a7eedf7f71cd2c72c0389b86f8c67e5a18a5a4
Public access to Syn library