chore: restructure build commands

- 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

integration-testing/multi-nodejs-test/test.sh

@@ -12,7 +12,8 @@ cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
 # It does (almost) not test for correctness, because that is already done in the mocha-tests.
 # And it does not use any NodeJS based testing framwork to make this part independent of the Node version.
 
-# A list of NodeJS versions is expected as cli-args
+unset npm_config_prefix
+
 echo "Handlebars should be able to run in various versions of NodeJS"
 for i in  0.10 0.12 4 5 6 7 8 9 10 11 ; do
     rm target node_modules package-lock.json -rf
@@ -23,4 +24,4 @@ for i in  0.10 0.12 4 5 6 7 8 9 10 11 ; do
     nvm exec "$i" npm run test-precompile || exit 1
 
     echo Success
-done
+done