requirements update

setup.py

@@ -14,7 +14,7 @@
                       'django', 'django_extensions', 'wirebin', 'nltk',
                       'sqlalchemy', 'nose', 'nose-exclude', 'BeautifulSoup',
                       'pyyaml', 'simplejson', 'pygeoip', 'diff-match-patch',
-                      'python-igraph'),
+                      'python-igraph==0.5.3', 'numpy', 'matplotlib'),
     #cmdclass = {'build_ext': build_ext},
     #ext_modules = ext_modules
 )