Isolate CarrierWave uploads in test enviroment

spec/spec_helper.rb

@@ -45,6 +45,10 @@ RSpec.configure do |config|
   config.before(:suite) do
     TestEnv.init
   end
+
+  config.after(:suite) do
+    FileUtils.rm_rf('tmp/tests/files')
+  end
 end
 
 FactoryGirl::SyntaxRunner.class_eval do
@@ -58,3 +62,4 @@ RSpec::Rails::ViewRendering::EmptyTemplatePathSetDecorator.class_eval do
 end
 
 ActiveRecord::Migration.maintain_test_schema!
+CarrierWave.root = 'tmp/tests/files'