Merge pull request #1 from ati-ozgur/master

Windows Support
Update flatex.py

Gets \input or \include.
Update flatex.py

Adds a new line after replacing with file contents.
Update flatex.py

added comment at top about how to use as a python module
does not pull commented include or input
Merge pull request #2 from dvbrydon/master

 \input or \include
path in nested inputs do reference to the path of the base_file, not of the included file.
Merge pull request #3 from DasBasti/master

nested inputs