Added gfortran to travis.yaml due to failing use of sklearn
Added gfortran to travis.yaml due to failing use of sklearn

Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK,Purg/SMQTK