ci(travis): Add stylelint checks to travis ci
ci(travis): Add stylelint checks to travis ci

automatically run less style checks as part of travis ci build.

issue #379

paulerickson/uw-frame,uPortal-Project/uportal-app-framework,uPortal-Project/uportal-app-framework,UW-Madison-DoIT/uw-frame,paulerickson/uw-frame,UW-Madison-DoIT/uw-frame,thevoiceofzeke/uw-frame,UW-Madison-DoIT/uw-frame,paulerickson/uw-frame,uPortal-Project/uportal-app-framework,thevoiceofzeke/uw-frame,thevoiceofzeke/uw-frame