Update dependencies

express updated to ~4.0
async updated to ~0.8
yargs updated to ~1.2 (checked automatic dashed-to-camel key
conversion)
Passing NodeJS options to debugged process. Close #328

Added 'nodejs' option to node-debug.
Detecting Windows CMD files. Close #323

If debugged target found and has '.cmd' extension, inspector tries to
find real link in this cmd.