Remove xctool install command from travis-ci configuration.
Remove xctool install command from travis-ci configuration.

paulz/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory