Add SolveBio (irb) shell.
auth.rb: add optional email parameter. Give meaningful return values for login, logout, whoami
test-api.rb: Add DepsitoryVersion test. Structure constants better
apiresource.rb: Needs a SolveBio::SolveObject
resource.rb: Make ListObject Enumerable. We can now iterate over objects. Methos objects -> to_a which is more Ruby-ish. Comment more REGEXPs
solveobject.rb: solvebio_id -> id. Is more Rubyish.