Default CocoaPods install to update the pods repo. (#2081)
Default CocoaPods install to update the pods repo. (#2081)

CocoaPods updated their default install behavior some time ago to not update the pods repo, but our pods management script still appeared to be assuming that it did update the repo. This change inverts our pod install logic so that it updates the spec repo by default.

This resolves some Travis CI failures we've seen when downstream pod releases get published but not picked up by the Travis CI instance's pre-imaged pods repo.
randallli/material-components-ios,willlarche/material-components-ios,willlarche/material-components-ios,willlarche/material-components-ios,sigito/material-components-ios,material-components/material-components-ios,brianjmoore/material-components-ios,sigito/material-components-ios,material-components/material-components-ios,samnm/material-components-ios,material-components/material-components-ios,samnm/material-components-ios,brianjmoore/material-components-ios,samnm/material-components-ios,brianjmoore/material-components-ios,sigito/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,samnm/material-components-ios,samnm/material-components-ios,willlarche/material-components-ios,brianjmoore/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,brianjmoore/material-components-ios,sigito/material-components-ios,willlarche/material-components-ios,randallli/material-components-ios