[OR-947] - Gruntfile.js and Gruntfile-tests.js is not checked with gjslint - fix linter errors
[OR-947] - Gruntfile.js and Gruntfile-tests.js is not checked with gjslint - enable gjslint for the files
Merge pull request #676 in OR/rse from ~PKEWISCH/rse:OR-947 to master

* commit '2b8f04339feb50c7022448af4694fa50a36f52cd':
  [OR-947] - Gruntfile.js and Gruntfile-tests.js is not checked with gjslint - enable gjslint for the files
  [OR-947] - Gruntfile.js and Gruntfile-tests.js is not checked with gjslint - fix linter errors