Before, a single instance of yargs was accumulating options, so commands parsed later would have options from prior commands. That's because all yargs options are global by default. Now, a new instance of yargs is required before each command is parsed, so global options aren't accumulated.
fixes#1567
The schematics for React and Angular still refer to Angular CLI power-ups.
This also links the generated schematic for an Angular or React application
to their framework-specific pages.
