Fix watching and linting tasks in Gruntfile.js

Signed-off-by: Alexander Trefz <alexander.trefz@gmail.com>
Fix staticFileServing to include subdirectories

Signed-off-by: Alexander Trefz <alexander.trefz@gmail.com>
add config via nconf

Signed-off-by: Alexander Trefz <alexander.trefz@gmail.com>