Allow some TODOs to pass pylint

[delucchi-cmu]

I think TODOs are excellent resources, when done properly, e.g:

# TODO(#16) Add the extra calls here when they're ready

In this case, the TODO has a link to an issue related to the TODO.

pylint maybe only half-agrees with me, and gives a warning when it sees # TODO in python code. We can use the notes-rgx field in our .pylintrc to configure which notes will trigger pylint warnings.