Update Travis config.
Update Travis config.

SauceLabs tests keep on hitting unrelated socket failures, removing
these for now.

mtth/avsc,cdapio/ui-schema-parser,cdapio/ui-schema-parser,cdapio/ui-schema-parser,mtth/avsc,mtth/avsc,cdapio/ui-schema-parser,mtth/avsc,cdapio/ui-schema-parser,mtth/avsc