Include help in the command line interface

[mkempka]

The following command doesn't output anything:

$ tabris help run

I would expect help about the run command, for example how I can specify the emulator/device.

Obviously I'd expect similar commands to output useful information, too:

$ tabris help build
$ tabris help clean
$ tabris help help

etc.

[cpetrov]

Try tabris build -h

[mkempka]

So the information is already there. All the better. I still request the 'help' command. This seems to have become a de facto standard in the last years.

[mkempka]

eclipsesource/tabris-js-cli#31