Source install fails due exceptions in setup.py

[hiir]

Hello,

I stumbled over following issue.

When installing a package with spherecluster dependency and spherecluster is installed from source distribution (.tgz) then it fails with exception numpy is required during installation raised from setup.py#12 even when package has correctly numpy (and scipy) dependencies listed.

How to reproduce:

1. make a toy setup.py

from setuptools import setup

setup(
    name="spherecluster_test",
    version="1.0.0",
    install_requires=["numpy", "scipy", "spherecluster"]
)

2. build it to wheel

python setup.py bdist_wheel

3. try to install it with --no-binary option to force spherecluser source distribution:

pip install --no-binary "spherecluster" dist/spherecluster_test-1.0.0-py3-none-any.whl

Processing ./dist/spherecluster_test-1.0.0-py3-none-any.whl
Collecting scipy (from spherecluster-test==1.0.0)
  Using cached https://files.pythonhosted.org/packages/a8/0b/f163da98d3a01b3e0ef1cab8dd2123c34aee2bafbb1c5bffa354cc8a1730/scipy-1.1.0-cp36-cp36m-manylinux1_x86_64.whl
Collecting numpy (from spherecluster-test==1.0.0)
  Using cached https://files.pythonhosted.org/packages/16/21/2e88568c134cc3c8d22af290865e2abbd86efa58a1358ffcb19b6c74f9a3/numpy-1.15.3-cp36-cp36m-manylinux1_x86_64.whl
Collecting spherecluster (from spherecluster-test==1.0.0)
  Using cached https://files.pythonhosted.org/packages/27/27/614b9e568e9a9a8d46938310b7caf092657343bf037b9fae416baf611d06/spherecluster-0.1.6.tar.gz
    Complete output from command python setup.py egg_info:
    numpy is required during installation

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-gtqjhbjz/spherecluster/

I suggest to remove following lines from setup.py#L9-L19.

try:
    import numpy  # NOQA
except ImportError:
    print('numpy is required during installation')
    sys.exit(1)

try:
    import scipy  # NOQA
except ImportError:
    print('scipy is required during installation')
    sys.exit(1)