use button class on buttons

Change-Id: I5206c3a37c8e32882f23d72c84dbecb3a4a0c8ff

app/views/groups/edit.html.erb

@@ -39,7 +39,7 @@
       </p>
       <% form_tag api_v1_group_url(@group), :method => 'PUT', :class => 'group_avatar_form' do %>
         <p><input type="file" name="avatar" class="avatar_file"></p>
-        <p><button type="submit">Change</button>
+        <p><button type="submit" class="button">Change</button>
         <%= link_to "Cancel", "#", :class => "cancel_avatar" %></p>
       <% end %>
     </div>

app/views/groups/profile.html.erb

@@ -13,13 +13,13 @@
       <% end %>
 
       <% if @can_join %>
-        <p><button id="join_group">Join</button></p>
+        <p><button id="join_group" class="button">Join</button></p>
       <% elsif not @in_group %>
         <p>This group is not accepting new members at this time.</p>
       <% end %>
 
       <% if @group.is_public? %>
-        <p><button id="follow_group">Follow</button></p>
+        <p><button id="follow_group" class="button">Follow</button></p>
 
         <%# TODO: collections go here %>
       <% end %>

app/views/profile/show.html.erb

@@ -14,7 +14,7 @@
       <h1><%= @user.short_name %></h1>
       <p><%= format_message(@user.bio || "").first.html_safe %></p>
       <% if @can_follow %>
-        <p><button id="follow_user">Follow</button></p>
+        <p><button id="follow_user" class="button">Follow</button></p>
       <% end %>
     </div>
     <div class="span3">