re-enable install_requires; fix README UTF8 loading problem

environment.yml

@@ -0,0 +1,3 @@
+numpy>=1.8.1
+scipy>=0.14
+cython>=0.22.1

readthedocs.yml

@@ -0,0 +1,4 @@
+conda:
+
+python:
+    setup_py_install: true

setup.py

@@ -10,6 +10,7 @@
 from distutils.extension import Extension
 from Cython.Distutils import build_ext
 
+import io
 import glob
 import numpy as np
 
@@ -56,11 +57,24 @@
                'Topic :: Multimedia :: Sound/Audio :: Analysis',
                'Topic :: Scientific/Engineering :: Artificial Intelligence']
 
+# installation requirements
+install_requires = ['numpy>=1.8.1',
+                    'scipy>=0.14',
+                    'cython>=0.22.1']
+
+# obtain a long description from README
+try:
+    # needed to be able to read unicode files in Python 2 and 3
+    with io.open('README.rst', encoding='utf-8') as f:
+        long_description = f.read()
+except IOError:
+    long_description = ''
+
 # the actual setup routine
 setup(name='madmom',
       version=version,
       description='Python audio signal processing library',
-      long_description=open('README.rst').read(),
+      long_description=long_description,
       author='Department of Computational Perception, Johannes Kepler '
              'University, Linz, Austria and Austrian Research Institute for '
              'Artificial Intelligence (OFAI), Vienna, Austria',
@@ -74,4 +88,5 @@
       scripts=scripts,
       cmdclass={'build_ext': build_ext},
       test_suite='nose.collector',
+      install_requires=install_requires,
       classifiers=classifiers)