Fix the installation

The setup.py references requirements/base.in, so it needs to be included
in the distribution by naming it in MANIFEST.in

.gitignore

 ### Python artifacts
 *.pyc
 *.egg-info
+dist/
 
 ### Editor and IDE artifacts
 *~
@@ -17,4 +18,4 @@ codekit-config.json
 var/
 
 # virtualenvironment
-venv/
+venv/
\ No newline at end of file

MANIFEST.in

+include requirements/base.in
+include NOTICE
+include LICENSE