Merge pull request #83 from amueller/setup_fix

hopefully fixing cython built

requirements.txt

-Cython>=0.19.1
 Image>=1.1.7
 numpy>=1.7.1

setup.py

@@ -7,7 +7,7 @@ setup(
     url='https://github.com/amueller/word_cloud',
     description='A little word cloud generator',
     license='MIT',
-    ext_modules=[Extension("wordcloud/query_integral_image",
+    ext_modules=[Extension("wordcloud.query_integral_image",
                            ["wordcloud/query_integral_image.c"])],
     packages=['wordcloud'],
     package_data={'wordcloud': ['stopwords', 'DroidSansMono.ttf']}