- Code is from tree https://github.com/google/GTMAppAuth/tree/10d138eb05ad299fd6260741e7b92b0090db0963
- I contributed this code originally to GTMAppAuth on Dec 6, 2016 google/GTMAppAuth@2eb382f

- Add beginnings of 'AppAuthTV' Pod subspec
- Remove dependency on `GTMAppAuthFetcherAuthorization`
- Remove GTMAPPAUTH_USER_IMPORTS code
- Verified with `pod lib lint`

* Rename OID to GTM, remove extra header
* Remove TVConfigurationForGoogle, update copyright headers
* Return OIDAuthState instead of GTMAppAuthFetcherAuthorization
* Add AppAuthTV to Xcode targets, fix NSObject description method bug
* Add files to AppAuthTV target
* Remove property synthesize
* Add AppAuthTVTests target, pointing to UnitTests/UnitTestsInfo.plist and included in AppAuthTV scheme. Reorder imports
* Update min tvOS version and identifier for AppAuthTV target
* Correct capitalization in AppAuthTV identifier
* Update reference URLs, references to Google removed
* Remove non-functioning AppAuthTVTests target (tests coming in future PR)
* Fix indent spacing in OIDTVServiceConfiguration

* OIDTVAuthorizationRequest tests
* Add tests to AppAuthTVScheme
* add AppAuthTV to .travis.yml

Adds OIDTVTokenRequest class, which is a subclass of OIDTokenRequest, to better adhere to the [RFC for TV authentication](https://tools.ietf.org/html/rfc8628#section-3.4). This adds the required `device_code` property which is sent in the request body, which differs from the `code` property for the authorization code in the parent class. Additionally, the grant type for TV authorization is hard-coded in, and several unused fields are dropped from the initializer and body request code.

Update the example project to support discovery

…aximumSize: instead of #pragma

- Create a tvOS example README
- Document tvOS support in main README
- Link to tvOS example from the example README
- Add Google IdP tvOS details