Add "role=button" to Add Members link

Problem:
“Add member” appears visually as a button but is read as a link.

Solution:
Add role = “button” to “Add member” statement as shown below
<a id="show-add-block" class="btn btn-medium btn-primary btn-block" onclick="$('#add-blockcontainer').toggle('slow');
return false;" href="#" role=”button”>