Add pod linting to travis-ci config.
Add pod linting to travis-ci config.

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