- add prettier to do formatting
- add eslint-config-prettier to
disable rules conflicting with prettier
- remove eslint from grunt workflow
- use lint-stage to lint and format
on precommit
- use eslint and prettier in travis directly
- remove rules that are already part of
the "recommended" ruleset
That rational is that eslint and prettier should be run in
Travis-CI, on commit and as IDE integration (highlighting
errors directlry). They don't need to be run along with
test-cases. Getting linting errors when running the tests
because of missing semicolons is just annoying, but doesn't
help the overall code-quality.