Merge branch 'fix-spinach-unsubscribe-mr-test' into 'master'

Remove timing dependency on unsubscribe merge request test

This test failed for me once. I am now on a mission to remove `sleep` from the spinach tests.

See: http://www.elabs.se/blog/53-why-wait_until-was-removed-from-capybara

See merge request !523

features/steps/project/merge_requests.rb

@@ -61,8 +61,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
   end
 
   step 'I should see that I am unsubscribed' do
-    sleep 0.2
-    find(".subscribe-button span").text.should == "Subscribe"
+    find(".subscribe-button span").should have_content("Subscribe")
   end
 
   step 'I click button "Unsubscribe"' do