* Use "commander" for cli argv handling
* Handle different scripts version forms and exits without a name given
* Revert comment about min supported node version
* Check sooner for the minimal node version
* Add travis test for node <4
* Parse stderr in node versions <4
In the `create-react-app` command, try to install packages using Yarn.
If Yarn is not installed, use npm instead.
In `react-scripts`, detect if the project is using Yarn by checking if
a `yarn.lock` file exists. If the project is using Yarn, display all
the instructions with Yarn commands and use Yarn to install packages
in `init` and `eject` scripts.
Unfortunately, travis is not setup for private repos in the facebookincubator repo yet. I'll ping the relevant people tomorrow outside of the weekend :)
