Validate each example listing in the README.

[jkeyes]

Sanity test to see where the API support stands.

[jkeyes]

Added a test for the user examples: 4a3475f

[jkeyes]

Added a test for the admin examples: 7ce02fc

[jkeyes]

Added a test for the company examples: 9adaa4e I need to add support for the extended_api_operations as defined by intercom-ruby.

[jkeyes]

Added extended_api_operations for Company.users: aa876e0

[jkeyes]

Adding Tag (1f4fb5c) and Segment (aa2a029) tests.

[jkeyes]

Added Company (2ca6acd) tests.

[jkeyes]

Rate limit section is the last remaining piece.

[jkeyes]

All done. #67