fix issue #313, make concatenate_videoclips python 3 compatible.

[ghost]

No description provided.

[mbeacom]

Looks good. Ultimately, I think we should move the py2/py3 check to a new compat.py to handle py2/py3 compatibility. For now, this works! Thanks for your contributions @Earney.

[ghost]

@mbeacom .. I was starting to think the same thing.. I'll work on creating a compat.py file with contents:

import sys
PY3 = sys.version_info.major >=3

then I can look at replacing all the updates I've made with

from compat import PY3

where do you recommend that we place the compat.py file ? maybe moviepy/compat.py, right next to config.py ?

[ghost]

Can this issue be closed?