If calling ng2 without params, show help.

Also adds examples of usage.
See #69
Adds same help handler.

See #69
Fixes a bug when called outside a project.

Also adds help handler.
See #69
Add help handler.

See #69
Adds help handler.

See #69
Add port as parameter.

Also adds help handler and some logging.
See #69
By default set log prefix and verbosity to false.

See #69