Issue #3 - added code to support security groups' Ingress and Egress sections.  Also added comments in the existing code, and renamed local variable `a_property' into property_name (two occurrences total, both in `propertyCheck()') to keep variable names consistent.
Issue #3 - added code to support security groups' Ingress and Egress sections.  Also added comments in the existing code, and renamed local variable `a_property' into property_name (two occurrences total, both in `propertyCheck()') to keep variable names consistent.

controlgroup/cloudformation-lettuce-steps