Resolve "Contact attempts"

Closes #34 (closed)

this also contains a renaming of the model avaibility to availability. if we move to commit the migrations script, we should update this merge request to include a migration script before merging.

smash/web/templates/subjects/edit.html

@@ -82,7 +82,7 @@
             </div><!-- /.col-md-12 -->
         </div><!-- /.row -->
         <div class="row">
-            <div class="col-lg-6">
+            <div class="col-lg-12">
                 <div class="box box-success">
                     <div class="box-header with-border">
                         <h3>Contact attempts <a title="add a new contact attempt"