Mockups for new task display

This issue was spawned by https://github.com/gulpjs/gulp-cli/issues/39

Now that we have --tasks-simple and --tasks-json for tools to consume, we can re-envision what the output of --tasks can be.

I'd like some people to produce mockups for new display output of the task listing flag.

Things that must be supported in the mockup:

1. Display top level tasks prominently
2. Display nested task dependencies to all depths
3. Display the description next to each top level task but not on nested tasks
4. Display a list of flags for each top level task