* Adding functionality to query installations for user
* Rename method
* Adding installation methods
* Adding tests
* Adding observable client methods
* Adding InstallationResponse
* Adding GitHub Apps Installations Client
* Tweaking doc comments
* Undoing unintentional changes and cleaning up
* Reordering functions in clients to keep the same code look and feel
* Making sure all methods are documented with their authentication requirements
* Syntax error
* Renaming methods and tests
* Renaming property
* Test cleanup
* XmlDoc comment fixups and consistency
* rename User -To-Server auth methods from xxxForUser to xxxForCurrentUser
* rename GitHubAppsInstallationsClient to GitHubAppInstallationsClient to be consistent with single/plural naming conventions
* make method order match the order on github docs site
* tidy up usings
* correct implementation of GetALlInstallationsForCurrent method to be consistent
* Add missing unit and integration tests for ObservableGitHubAppsClient
* fix renamed method in observable tests
* Add EnsuresNonEmptyArguments tests and fixup asserts in GitHubAppsClient
* Add tests for new Observable client methods and fixup Null/Empty asserts in Observable client
* change non paginated call to call through to other method but with ApiOptions.None
* add unit tests for observable client and fixup errors they found
* add integration tests for new GitHubAppsClient methods, fixed an incorrect route that the tests found!
* add integration tests for extra methods on observable client
* add integration tests for new clients GitHubAppInstallationsClient and ObservableGitHubAppInstallationsClient
* deprecate renamed method properly, to avoid breaking change
