Narrative:
As a Developer
I want to specify that a property should not be translated
So that I can have minimal classes

Acceptance Criteria:

Scenario 1: Property exists
Given that the specified property exists on the 'From' class
When the Developer tries to exclude the property
Then the test for 'AllPropertiesMapped' will not fail on this property 

Scenario 2: Property does not exist
Given that the specified property does not exist on the 'From' class
When the Developer tries to exclude the property
Then the exclusion should fail
 And the property name should be shown

Scenario 3: Property already mapped
Given that the specified property exists
 And the property already has a mapping
When the Developer tries to exclude the property
Then the exclusion should fail
 And the property name should be shown