Issue #205 Modified Organization and Organizations interfaces to support
fetching organizations by name. Also modified MkOrganizations and
MkOrganizationsTest classes.
Issue #205 Refactored RtOrganization and RtOrganizations classes to
reflect interface changes.
Issue #205 Changed id() method to number(), added github() method.
Issue #205 Removed method name check suppressions
Merge pull request #228 from carlosmiranda/205

#228: pull request Issue #205: Organization API refactored to allow lookups by login name