As a consumer of PF4 React Extensions, I'd like to be able to fully customize the icon provided to the Catalog Tile. This would allow me to pass custom JSX (including PF React Icons).

Todo:

• add an icon prop that can replace the current JSX rendered for the iconImg or the iconClass.

https://github.com/patternfly/patternfly-react/blob/master/packages/patternfly-3/patternfly-react-extensions/src/components/CatalogTile/CatalogTile.js#L120