Minor tweaks to templates, permissions fix

geogame/templates/main/edit_challenge_form.html

@@ -1,4 +1,4 @@
-{% extends 'base.html' %}
+{% extends 'game_base.html' %}
 {% load staticfiles%}
 
 {% block content %}

geogame/templates/main/homepage.html

@@ -36,7 +36,8 @@
           You must be logged in to play the game. Please read the FAQ for more info.
         </div>
         <button type="button" class="btn btn-info btn-lg btn-block" disabled>Continue Last Game</button>
-        <button type="button" class="btn btn-success btn-lg btn-block" disabled>New Game</button>
+        <button type="button" class="btn btn-success btn-lg btn-block" disabled>New Random Game</button>
+        <button type="button" class="btn btn-warning btn-lg btn-block" disabled>View Challenges</button>
       {% endif %}
     </div>
   </div>