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.
* Forked react-scripts should retain the binary name
* Forked react-scripts should retain the binary name -- fixed issue with regex
* Forked react-scripts should retain the binary name -- fixed style nit