Added comma delimiting template filter and applied it to project_deta…

…il template countries (#164)

projects/templates/projects/project_detail.html

@@ -1,5 +1,5 @@
 {% extends 'base.html' %}
-{% load mkdown_filters %}
+{% load mkdown_filters projects_tags %}
 {% block main %}
     <h1>{{ project.name }}</h1>
     {% if can_update %}
@@ -39,7 +39,7 @@ <h2>Project Details</h2>
         </tr>
         <tr>
             <th width="30%">Country</th>
-            <td>{{ project.countries }}</td>
+            <td>{{ project.countries.all|join }}</td>
         </tr>
         <tr>
             <th width="30%">Locality</th>

projects/templatetags/projects_tags.py

@@ -0,0 +1,11 @@
+from django import template
+
+register = template.Library()
+
+
+def joinby(value, delim=', '):
+    string_values = [u'{0}'.format(v) for v in value]
+    return delim.join(string_values)
+
+register.filter('join', joinby)
+