correct setup.py to include numpy headers

setup.py

 
 import os
+import numpy
 from distutils.core import setup
 from distutils.extension import Extension
 from Cython.Distutils import build_ext
 
 setup(name='sprint',
-      ext_modules=[Extension('test',['test.pyx'],libraries=['type'],library_dirs=[os.getcwd()])],
+      ext_modules=[Extension('test',['test.pyx'],
+                             libraries=['type'],
+                             library_dirs=[os.getcwd()],
+                             include_dirs=[numpy.get_include()])],
       cmdclass={'build_ext':build_ext}
       )