* This code adds functionality to check the delta certificates in a chain. The main operation validates that the delta belongs in that chain and then that the chain establishes correct component modification. No removes before an add, no add to a component that exists, no remove to a component that doesn't exist. The unit test was updated to not use any flat file certificate.
Closes#109
* Changes were made to the validation of a delta certificate based on newer information. There can be multiple bases and multiple leaves in a tree of associated certificates. However currently we don't have certificates to validate the entirety of the code to test.
* Updated the code to treat the platform attributes policy, if v2, against all in the chain rather than one at a time.
* Added methods and placeholders for checking the supply chain for base and delta credentials according to the new TCG spec
Checkstyle changes
Created a new SupplyChainValidation.ValidationType for delta credential attributes. The existing PLATFORM_CREDENTIAL
ValidationType will be used for both base and delta platform credentials from spec 1.1.
* Checkstyle error: trailing spaces
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations.
Added an additional null check for a platform supply validation. Added a mapping object for platform credential to the associated attributes during validations. Missed import statement.
