Use fail! in callback_phase

The omniauth library provides a fail! method to hook a failure in a
plugin, which the azure plugin isn't using.

AzureAD#17

lib/omniauth/strategies/azure_activedirectory.rb

@@ -84,8 +84,8 @@ def request_phase
       # the authentication process. It is called after the user enters
       # credentials at the authorization endpoint.
       def callback_phase
-        error = request.params['error_reason'] || request.params['error']
-        fail(OAuthError, error) if error
+        error = request.params['error_description'] || request.params['error_reason'] || request.params['error']
+        return fail!(error) if error
         @session_state = request.params['session_state']
         @id_token = request.params['id_token']
         @code = request.params['code']

omniauth-azure-activedirectory.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.email           = '[email protected]'
   s.summary         = 'Azure Active Directory strategy for OmniAuth'
   s.description     = 'Allows developers to authenticate to AAD'
-  s.homepage        = 'https://github.com/AzureAD/omniauth-azure-activedirectory'
+  s.homepage        = 'https://github.com/carezone/omniauth-azure-activedirectory'
   s.license         = 'MIT'
 
   s.files           = `git ls-files`.split("\n")