Merge branch '807-fix-wrong-spinach-step-classname' into 'master'

Rename Spinach::Features::AdminGitHooksSample to Spinach::Features::AdminPushRulesSample

Closes #807.

See merge request !588

features/steps/admin/push_rules.rb

 require 'webmock'
 
-class Spinach::Features::AdminGitHooksSample < Spinach::FeatureSteps
+class Spinach::Features::AdminPushRulesSample < Spinach::FeatureSteps
   include SharedAuthentication
   include SharedProject
   include SharedPaths