[github] nitpick: use say instead of reply

So the bot won't highlight me when I link to an issue
Strip timezone... that should close 463
[tests] Ignore main willie.py for now

pytest really dislikes the fact that our main executable has the same name
as the module.

I'll add this file to make it ignore willie.py for now, but this means
we can't actually have tests on our main executable which kinda sucks.
Add dev-requirements.txt file, documenting requirements to run tests
Add .travis.yml file for Travis CI and Coveralls.io integration
Change submodule URL to use HTTPS rather than SSH

So that services like Travis can fetch the submodule
Fix unicode issues with tests
Tell Travis not to init submodules
Clarify reasons for dev-requirements.txt

and load the file in setup.py, so it's not duplicated