If there aren't any local WP-CLI community commands, don't show an empty table.
Move the logic to get community packages to its own method. Need to use it in the installer.
Remove extra code made moot by dad6b52
Support for installing a WP-CLI community package.
Static variable caching goodness
Rather than checking if the package requires `wp-cli`, let's just see if the package is listed in our Packagist.

All of the commands listed in Packagist right now don't have `wp-cli` as a requirement, so that check is pointless.