Merge pull request #200 from edx/talbs/fix-grade-steptitle

FIX - Grade Step Header Visual Emphasis

apps/openassessment/templates/openassessmentblock/grade/oa_grade_waiting.html

 {% spaceless %}
-<li id="openassessment__grade" class="openassessment__steps__step step--grade is--waiting">
+<li id="openassessment__grade" class="openassessment__steps__step step--grade">
     <header class="step__header ui-toggle-visibility__control">
         <h2 class="step__title">
             <span class="wrapper--copy">