title: module' object has no attribute 'find_template_source satchmo-django
body: <p>after finished installing satchmo in django1.4 . 
  i got this error "module' object has no attribute 'find_template_source"</p>
  
  <pre><code>AttributeError at /
  'module' object has no attribute 'find_template_source'
  Request Method: GET
  Request URL:    "link url"
  Django Version: 1.4.8
  Exception Type: AttributeError
  Exception Value:    
  'module' object has no attribute 'find_template_source'
  Exception Location: /home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_app_plugins-0.1.0-py2.7.egg/app_plugins/templatetags/app_plugins.py in template_exists, line 162
  Python Executable:  /home/prabhakaran/virtual/dj1.4_satchmo/bin/python
  Python Version: 2.7.6
  Python Path:    
  ['/home/prabhakaran/softwares/satchmo/store',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_threaded_multihost-1.4_1-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/sorl_thumbnail-12.1c-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_livesettings-1.4_14-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_keyedcache-1.5.1-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/Sphinx-1.3b1-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/Babel-1.3-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/snowballstemmer-1.2.0-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/docutils-0.12-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/Pygments-2.0.1-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/six-1.8.0-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/pytz-2014.9-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/MarkupSafe-0.23-py2.7-linux-i686.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/South-1.0.1-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/suds-0.4-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/Satchmo-0.9.3-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_app_plugins-0.1.0-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages/django_caching_app_plugins-0.1.3-py2.7.egg',
   '/home/prabhakaran/virtual/dj1.4_satchmo/lib/python2.7',
   '/home/prabhakaran/virtual/dj1.4_satchmo/lib/python2.7/plat-i386-linux-gnu',
   '/home/prabhakaran/virtual/dj1.4_satchmo/lib/python2.7/lib-tk',
   '/home/prabhakaran/virtual/dj1.4_satchmo/lib/python2.7/lib-old',
   '/home/prabhakaran/virtual/dj1.4_satchmo/lib/python2.7/lib-dynload',
   '/usr/lib/python2.7',
   '/usr/lib/python2.7/plat-i386-linux-gnu',
   '/usr/lib/python2.7/lib-tk',
   '/home/prabhakaran/virtual/dj1.4_satchmo/local/lib/python2.7/site-packages',
   '../../apps',
   '']
  Server time:    Wed, 19 Nov 2014 06:02:54 -0800
  
  
    "
  
  module' object has no attribute 'find_template_source
  
  "
  </code></pre>