Installation dependency

[mmiladi]

Hello,

It seems that numpy is needed for setting up installation with pip, otherwise the pip installer complains with:

  Cache entry deserialization failed, entry ignored
  Using cached https://files.pythonhosted.org/packages/ce/41/99b51880c9d9835218978008cf75851f2257f9fe0271e5d76c96b17fe501/poreplex-0.4.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-POhzuX/poreplex/setup.py", line 26, in <module>
        import numpy
    ImportError: No module named numpy