Update order of After hooks

[erran]

• Validate that Cucumber::Core::Test::Mapper returns adds after hooks in
  reverse order. See After hooks should be run in reverse order #64.
• Use #unshift instead of #<< to add new after hooks
  • Array#unshift prepends vs. Array#<< which appends

[erran]

@mattwynne @brasmusson Pointing to my changes in my Gemfile causes After hooks work again in my test suite. The failures I was experiencing related to some of my hooks cleaning up while another was logging out an API client. I figured changing the root cause vs. the order I declared the hooks would be more useful.

Gemfile changes

ecarey@aus-mac-1033 ~/r/i/c/automation (cucumber-2.0)> git diff Gemfile
diff --git a/Gemfile b/Gemfile
index 603ef26..57936d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,6 +31,7 @@ group :reporting do
 end

 group :test do
+  gem 'cucumber-core', github: 'erran/cucumber-ruby-core', branch: 'after-hook-order'
   gem 'cucumber', '~> 2.0.0.beta.2'
   gem 'rspec'

[lock]

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