Closes swcarpentry/styles#283

`site.email` is used as:

_includes/lesson_footer.html:	        <a href="mailto:{{ site.email }}">Contact</a>
_includes/workshop_footer.html:	<a href="mailto:{{ site.email }}">Contact</a>

Therefore, it does not make sense to have `mailto` in the `email` itself.

Rename CoC file to align with GitHub's Community Profile expectation

See https://help.github.com/articles/about-community-profiles-for-public-repositories/.

Fix lesson_check.py

Run lesson-fixme from within lesson-check

Change shebang to Python3

Close swcarpentry/styles#271

Make Jekyll ignore .Rproj

Port of https://github.com/swcarpentry/r-novice-inflammation/commit/9da857efb16d7351127f2d5c46fc0af660654506.

Close swcarpentry/styles#274

Improve .travis.yml to build the lesson

Remove root and layout from YAML for boilerplate

Remove unnecessary super call

Use Python3-style class declaration

util.py: make functions return NotImplemented

missing comma in boilerplate generation

lesson_check: fix create_checker function

utils.py: simplify report function

Fix font size of h2 in call out box

Close swcarpentry/styles#244

Add README to bin/lesson_initialize.py

This is a revamp of swcarpentry/styles#248.

Thanks to Andy Boughton.

Fix line wrap after dash in code block

Close swcarpentry/styles#249

Move boilerplate files to their own file

repo_check: use argparse and remove unused variable

lesson_check: get_val is a static method