Handling of FileNotFoundError in setup.py for build_ext.run

[prokopst]

Installation from the pypi repository was failing during the build of extensions so I've fixed it by "handling" FileNotFoundError.

This is the traceback I had:

    Traceback (most recent call last):
      File "C:\Users\PROST_~1\AppData\Local\Temp\pip-ts3utdkg-build\setup.py", line 36, in run
        build_ext.run(self)
      File "C:\Program Files\Python 3.5\lib\distutils\command\build_ext.py", line 338, in run
        self.build_extensions()
      File "C:\Program Files\Python 3.5\lib\distutils\command\build_ext.py", line 447, in build_extensions
        self._build_extensions_serial()
      File "C:\Program Files\Python 3.5\lib\distutils\command\build_ext.py", line 472, in _build_extensions_serial
        self.build_extension(ext)
      File "C:\Users\PROST_~1\AppData\Local\Temp\pip-ts3utdkg-build\setup.py", line 45, in build_extension
        build_ext.build_extension(self, ext)
      File "C:\Program Files\Python 3.5\lib\distutils\command\build_ext.py", line 532, in build_extension
        depends=ext.depends)
      File "C:\Program Files\Python 3.5\lib\distutils\_msvccompiler.py", line 259, in compile
        self.initialize()
      File "C:\Program Files\Python 3.5\lib\distutils\_msvccompiler.py", line 180, in initialize
        vc_env = _get_vc_env(plat_spec)
      File "C:\Program Files\Python 3.5\lib\distutils\_msvccompiler.py", line 71, in _get_vc_env
        vcvarsall = _find_vcvarsall()
      File "C:\Program Files\Python 3.5\lib\distutils\_msvccompiler.py", line 33, in _find_vcvarsall
        access=winreg.KEY_READ | winreg.KEY_WOW64_32KEY
    FileNotFoundError: [WinError 2] The system cannot find the file specified

[prokopst]

The Travis CI build failed because:

ConnectionResetError: [Errno 104] Connection reset by peer

The command "pip install cython" failed and exited with 2 during .

[lock]

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