I created a gist that can be checked out and run to demonstrate the issue this solves.

Without this change in place coffeelint Gruntfile.coffee will report the missing use strict and grunt will report all is fine. The correct output should look like this

➜  140023f09a10c2d0a149 git:(master) ✗ npm test
> gcl-test@0.0.0 test /tmp/140023f09a10c2d0a149
> coffeelint Gruntfile.coffee; grunt
resolve /tmp/140023f09a10c2d0a149
  ✗ Gruntfile.coffee
     ✗ #4: Missing 'use strict' statement.
✗ Lint! » 1 error and 0 warnings in 1 file
Running "coffeelint:tests" (coffeelint) task
resolve /tmp/140023f09a10c2d0a149
Gruntfile.coffee
  ✖  line 4  Missing 'use strict' statement
✖ 1 error
Warning: Task "coffeelint:tests" failed. Use --force to continue.
Aborted due to warnings.
npm ERR! Test failed.  See above for more details.
npm ERR! not ok code 0