Update .travis.yml
Update .travis.yml

Prevent travis from overriding the selected compiler versions
nemerle/Segs,Segs/Segs,Segs/Segs,broxen/Segs,nemerle/Segs,Segs/Segs,broxen/Segs,nemerle/Segs,nemerle/Segs,nemerle/Segs,broxen/Segs,Segs/Segs,Segs/Segs,broxen/Segs,Segs/Segs,nemerle/Segs,broxen/Segs,Segs/Segs,nemerle/Segs,broxen/Segs,broxen/Segs