Do not run tests in parallel with travis
Do not run tests in parallel with travis

This stresses memory too much (esp. with gcc) which makes the
compilation process crash under travis, esp. for test/cases

serge-sans-paille/pythran,pbrunet/pythran,pombredanne/pythran,serge-sans-paille/pythran,pbrunet/pythran,hainm/pythran,pombredanne/pythran,pombredanne/pythran,hainm/pythran,pbrunet/pythran,hainm/pythran