Add OrganizationApi with GetOrganization and GetRepositories
Make sure CustomEnumValueSerializer can work with RepositoryTypes enum
Add Organization test
Merge pull request #5 from qntmfred/master

Add OrganizationApi with GetOrganization and GetRepositories
Thanks, qntmfred!  Sorry it took a couple days - I was waiting for the email notification that the PR had been updated, but never got one and only just now looked it up to check.

Nice to have Org support now!