Add generation of travis via haskell-ci adding tested-with.

[philderbeast]

Add generation of travis via haskell-ci adding tested-with.

[philderbeast]

With the haskell-ci project there's a way to generate the travis script but this relies on having tested-with attributes. Please add this attribute.

[danfran]

I put on hold the other changes you made until this will be solved.