Merge pull request exxeleron#20 from jreback/libpython_fix

BLD: libpython dep is only necessary for windows

Author: maciejlach

conda.recipe/meta.yaml

@@ -11,7 +11,7 @@ requirements:
     - numpy
     - pandas
     - cython
-    - libpython
+    - libpython [win]
 
   run:
     - python