added basic structure of facility translation with corresponding tests
added tests for a general derived facility (using a mock parser) and the repository translator, including optional arguments. also added a JsonRepositoryTranslator that correctly constructs a repo node.
added ability to represent reactors in xml and json, just need to write the translation function
reactor translation now available with testing. I've started off with a good seed idea here, and it has grown into other reasonable ideas (as far as object definition), but I've differed between repositories and reactors. I expect to finish the fuel cycle section and then refactor
adds facility capabilities and testing to the translation apparatus