added Step, StepActions, and escalation

This will be used to access lims escalations from the API
![plop](http://1.bp.blogspot.com/-KoRxQwwVrP0/UDgQLlYZ_0I/AAAAAAAAALY/DU6hux5p8Dc/s400/BLOG+ventas+para+el+crecimiento+empresarial,+PLOP.jpg)