Simplify travis config again now scope of problem is known.
Simplify travis config again now scope of problem is known.

james-monkeyshines/ensembl,Ensembl/ensembl,muffato/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,muffato/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,muffato/ensembl,muffato/ensembl