Merge branch 'qa_issue_177' into 'master'

QA - Wait for create merge request button to appear

Closes gitlab-qa#177

See merge request gitlab-org/gitlab-ce!17115

qa/qa/page/project/show.rb

@@ -45,6 +45,10 @@ module QA
         end
 
         def new_merge_request
+          wait(reload: true) do
+            has_css?(element_selector_css(:create_merge_request))
+          end
+
           click_element :create_merge_request
         end