Added conda environment definition and appveyor configuration

Author: tpeulen

setup.py

@@ -41,9 +41,9 @@ def build_extension(self, ext):
 
         if platform.system() == "Windows":
             cmake_args += ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}'.format(cfg.upper(), extdir)]
-            # if sys.maxsize > 2**32:
-            #     cmake_args += ['-A', 'x64']
-            # build_args += ['--', '/m']
+            if sys.maxsize > 2**32:
+                cmake_args += ['-A', 'x64']
+            build_args += ['--', '/m']
         else:
             cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
             build_args += ['--', '-j1']