BF: isrow only exists in later versions of matlab.

So - we ship our own.
Python3 fixes
Decode opened files
BF: No need for these calls to `decode`.

In my hands, these caused crashes on installation and testing on both python 2
and python 3.
add install_name_tool/patchelf instructions to the readme
Merge pull request #88 from dougalsutherland/readme

add install_name_tool/patchelf instructions to the readme
Update README.md

Typo
Merge pull request #89 from bischofs/patch-1

Update README.md
Merge pull request #82 from arokem/isrow

BF: isrow only exists in later versions of matlab.
Make get_variable return None if the var doesn't exist in the Matlab workspace.
Merge pull request #92 from dukebody/master

Make get_variable return None if the var doesn't exist in the workspace.