[ci] remove DEFER_GC env variable

no need for it, Ruby is fast enough now

.travis.yml

@@ -15,33 +15,33 @@ gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_edge.gemfile
 env:
-  - DEFER_GC=false RAILS_EDGE=true
+  - RAILS_EDGE=true
 before_install:
   - gem install bundler --version 1.11.2
 script: "bundle exec rake spec"
 matrix:
   exclude:
     - rvm: 1.9.3
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.0.0
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.1
       gemfile: gemfiles/rails_edge.gemfile
   allow_failures:
     - rvm: 1.9.3
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.0.0
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.1
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.2
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true
     - rvm: 2.3.0
       gemfile: gemfiles/rails_edge.gemfile
-      env: DEFER_GC=false RAILS_EDGE=true
+      env: RAILS_EDGE=true

spec/spec_helper.rb

@@ -522,11 +522,4 @@ class ::ActionView::Base
       allow(Formtastic.deprecation).to receive(:deprecation_warning).with(method, instance_of(String), instance_of(Array))
     end
   end
-
-  config.before(:all) do
-    DeferredGarbageCollection.start unless ENV["DEFER_GC"] == "false"
-  end
-  config.after(:all) do
-    DeferredGarbageCollection.reconsider unless ENV["DEFER_GC"] == "false"    
-  end
 end