Add cloned state helpers (#7)

* Adds Cloneable state
Any state object can implement this and the
transaction will make sure a copy is passed into each step rather than the previous object.

* adds readme example

* docker up the test run script

* add dev/test instructions

Handle revert errors better (#6)

* Catch and wrap up failures in applying compensation steps

update changelog for 0.2.0 release

Create .scrutinizer.yml