Do not depend on buildout.

slapgrid is using bootstrap for buildout, so it does not depend on it as on
library.

setup.py

@@ -39,8 +39,6 @@ setup(name=name,
       'supervisor', # slapgrid uses supervisor to manage processes
       'xml_marshaller>=0.9.3', # to unmarshall/marshall python objects to/from
                                # XML
-      'zc.buildout>=1.5.0', # slapgrid uses buildout as its backend to do the
-                            # job
       'zope.interface', # slap library implementes interfaces
         ] + additional_install_requires,
       zip_safe=False, # proxy depends on Flask, which has issues with