component/matplotlib add new dependencies in matplotlib

Ocropy needs one of matplotlib component to be imported during
buildout. This component needs cycler and dateutil

component/matplotlib/buildout.cfg

@@ -29,7 +29,10 @@ CFLAGS = -I${libpng:location}/include -I${freetype:location}/include
 recipe = zc.recipe.egg:custom
 egg = matplotlib
 environment = matplotlib-env
-setup-eggs = ${numpy:egg}
+setup-eggs =
+  cycler
+  python-dateutil
+  ${numpy:egg}
 rpath =
   ${libpng:location}/lib
   ${freetype:location}/lib