- move dtslint (checkTypes) away from Gruntfile.js
(as it disturbs debugging `grunt`)
and call it directly as npm-script in travis-ci
- re-group task definition in Gruntfile.js
- use a multi-job travis build to
run linting, format, dtslint and tests
in parallel
- run only "npm test" on appveyor
- rename Grunt-tasks for be more descriptive
- SAUCE_USERNAME is not a secret variable anymore
it can be easily guessed anyway and the
[secure] value messes up with a lot of the
log output
- linting on commit disable during transition