Run matdump and test_mat during Travis CI build
Run matdump and test_mat during Travis CI build

tbeu/matio,tbeu/matio,NJannasch/matio,NJannasch/matio,MaartenBent/matio,MaartenBent/matio,MaartenBent/matio,tbeu/matio,tbeu/matio,MaartenBent/matio