Rails 5 Update

* We have to detect the rails version specified in the Gemfile.
  If we are using Rails 5, we have to point to a prerelease version
  of draper for compatibility. If not, we can use draper ~> 2.1.

SEE: drapergem/draper#697

ama_layout.gemspec

@@ -22,11 +22,16 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rails", ">= 4.2"
   spec.add_dependency "sass-rails", "~> 5.0"
   spec.add_dependency "font-awesome-sass", "4.7.0"
-  spec.add_dependency "draper", "3.0.0.pre1"
+  # Sigh ... SEE: https://github.com/drapergem/draper/issues/697
+  if Gem::Specification.find { |s| s.name == 'rails' }.version < Gem::Version.new('5.0.0')
+    spec.add_dependency "draper", "~> 2"
+  else
+    spec.add_dependency "draper", ">= 3.0.0.pre1"
+  end
   spec.add_dependency "browser", "~> 2.0"
   spec.add_dependency "breadcrumbs_on_rails", "~> 3.0.1"
   spec.add_development_dependency "bundler", "~> 1.11"
-  spec.add_development_dependency "rake", "~> 11.0"
+  spec.add_development_dependency "rake", ">= 11.0"
   spec.add_development_dependency "rspec-rails"
   spec.add_development_dependency "factory_girl"
   spec.add_development_dependency "simplecov"