Rename MethodBehavior to CaseBehavior.  The vast majority of MethodBehaviors are specific to Case objects.  Renaming now to ease the upcoming switch from MethodInfo/ExceptionList arguments to simple Case arguments.
Rename MethodBehaviorBuilder to CaseBehaviorBuilder to match the new naming of the objects this class is responsible for building.
Simplify the CaseBehavior interface so that a simple Case object can be passed around instead of separate MethodInfo/ExceptionList pairs.
Replace MethodAction with CaseAction in order to simplify case-level setups and teardowns.
CaseBehaviorAction's final argument changes from CaseBehavior to Action, to ease consumers' ability to create CaseBehaviorActions.  Instead of consumers having to say innerBehavior.Execute(@case, instance), they simply say innerBehavior().
InstanceBehaviorAction's final argument changes from InstanceBehavior to Action, to ease consumers' ability to create InstanceBehaviorActions.  Instead of consumers having to say innerBehavior.Execute(fixture), they simply say innerBehavior().
TypeBehaviorAction's final argument changes from TypeBehavior to Action, to ease consumers' ability to create TypeBehaviorActions.  Instead of consumers having to say innerBehavior.Execute(testClass, convention, cases), they simply say innerBehavior().