add importlib to dependencies

.travis.yml

@@ -7,5 +7,6 @@ install:
   - pip install ipaddr
   - pip install psutil
   - pip install sqlalchemy
+  - pip install importlib
 script: cd tests && nosetests
 

setup.py

@@ -24,6 +24,7 @@ analytic tools for the results they produce.
         'ipaddr',
         'lxml',
         'progressbar',
+        'importlib',
     ],
     license='LGPLv2',
     classifiers=[