Add unit tests for Port class
Add unit tests for Parameter class

Also modified PortTest with better assert methods.
Add two-arg constructor test to PortTest
Add JSO constructor tests to PortTest and ParameterTest

Need to be completed with GWTTestCase.
Add unit tests for Component class
Refactor ValueJSO to use a generic for #setDefault
Add unit tests for Value class

Is this class used anywhere?