VER: 0.1.1: Ignore errors if not an ".ipynb" file

[mforbes]

This changeset ignores errors in files that do not end with .ipynb and bumps the version. I would like to use this to help solve some issues with version controlling notebooks: would you be willing to push it to PyPI? I could do it too, but don't want to steal then nbstripout name if you would like to maintain it.

It seems to push fine as is, though should probably have a licence file. I tested it here:

https://testpypi.python.org/pypi?%3Aaction=pkg_edit&name=nbstripout

[mforbes]

I decided to change the behavior so that only .ipynb files are processed by default. This will be faster than processing a whole bunch of files and failing. The old behaviour can be obtained with a -f flag. I also allow multiple files to be processed at once.

This version works with some mercurial aliases I am exploring in my mmf_setup project.

[mforbes]

I would like to get this all working now, so my proposal is to close this PR, update my branch to 0.2 and I will push this to PyPI as nbstripout 0.2.x. I am happy to revert control to you if you want it later, and will only use versions 0.2.x so you have control of all other version numbers.

[kynan]

Superseded by #2