Also install regex-tdfa in travis.
Also install regex-tdfa in travis.

ihc/futhark,HIPERFIT/futhark,mrakgr/futhark,ihc/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark,CulpaBS/wbBach,mrakgr/futhark,diku-dk/futhark,diku-dk/futhark,mrakgr/futhark,ihc/futhark