Task 22: Improved command line interface

[thejhh]

New command line arguments:

• --cwd=DIR -- changes the current process directory to another one before other command line arguments have been processed
• --dir=DIR -- Use this directory as a default for detecting configuration files. Defaults to CWD.
• --options=FILE -- loads CLI configuration from this file, and the configuration properties are same as command line options
  • If the FILE is a directory and DIR/norjs.json exists, use it.
• --config=FILE -- loads app configuration from this file
  • If the FILE is a directory and DIR/app.json exists, use it.
• norjs run ./path/to/app should also work and initialize it with --dir=FILE instead of --config=FILE