Removing googleAuth and googleAuthR_js support

If you are still using the deprecated with_shiny() then please depend on package googleAuthR == 1.4.1

• Removed with_shiny() and googleAuth modules that have been deprecated for a while -use gar_shiny_* instead.
• Improved error handling with custom http errors - API responses with errors will create R error conditions http_404 which can be used to more refined processing.

Big fix for service creation functions

• Fix gar_service_create() and dependent functions since error message changed for service email (#197)
• Better error if gar_service_get_roles() finds no roles

Prettier and easier

googleAuthR 1.4.0

• Fix batching when response has a blank line in first line
• Retry on 408 status codes (#199)
• Add filter down to roles for one accountId in gar_service_get_roles()
• Prettier startup messages via cli
• Make setup flow easier without needing so many R restarts

IAM bug fix

• Fix gar_set_client() returning web-project id if expecting project id and both env arguments are set.
• Fix gar_service_provision() and gar_service_get() as API error message changed (#197)

Creating service keys and setup wizard helpers

• Let you supply your own URL for discovery documents in gar_discovery_api()
• Change defaults on gar_create_package() to check = FALSE, github=FALSE
• Add class 'list' to gar_discovery_*() objects so they work with jsonlite
• Add gar_service_list() and gar_service_get()
• If using gar_service_create() and it already exists, will return existing via gar_service_get()
• Move the setup wizard functions from googleCloudRunner to googleAuthR so they are available for all packages.
• Remove deprecated new_user param from gar_auth()

Bugs and fixes, add provision service accounts

• Add gar_scope_config
• Add Docker build available at gcr.io/gcer-public/googleauthr
• More API error feedback if using googleAuthR.verbose < 3
• Auto-auth should succeed if one of the scopes needed is present
• Set default scopes to "https://www.googleapis.com/auth/cloud-platform" in gar_gce_auth
• Corrected and clarified googleSignIn documentation (#171, @jonthegeek).
• Fix gar_debug_parsing() message
• Remove deprecated gar_auth_jsUI since it causes an issue when used
• Add functions gar_service_* to provision service accounts via R (#178)
• Remove OAuth2 login parameter approval_prompt as its replaced by prompt (#177 - thanks @OuNao/@rasmes/@hugovk)

Bug fixes of bug fix

• Allow to be used by R 3.3 via custom isFALSE function (#158 - thanks @matthijsvanderloos)
• Web JSON client id messaging
• Auto_auth works on startup now

Bug fixes

• Add default scope of "https://www.googleapis.com/auth/cloud-platform" to gar_gce_auth()
• Improvements to stop gar_auto_auth() block library installation if auth files not correct.

New gargle backend

• Implement library(gargle) as backend for authentication functions
• Auto-attempt authentication via gar_auth() if an API call has no auth set
• Remove explicit R6 dependency as imported via gargle
• Enable some customization of googleSignInUI's logout button via logout_name and logout_class parameters
• Expose information whether user is signed in via googleSignIn module
• Auto-auth by specifying an email address in gar_auto_auth()

usethis update

googleAuthR v0.8.1

• Depend on usethis for create_package() and use_github() as they are
  removed in devtools 2.1.0 (@jimhester, #150).