update .travis.yml to use TravisCI_1 and TravisCI_2 groups
update .travis.yml to use TravisCI_1 and TravisCI_2 groups

Metacello/metacello,StephanEggermont/metacello-work,seandenigris/metacello-work,dalehenrich/metacello-work,seandenigris/metacello-work,pharo-project/pharo-metacello,krono/metacello-work,demarey/metacello-work,pharo-project/pharo-metacello,demarey/metacello-work,dalehenrich/metacello-work,krono/metacello-work,StephanEggermont/metacello-work