Correct name mismatch related to set_Params_TaylorN

Corrected a name mismatch related to set_Params_TaylorN that
made that tests were not passing.
Change .travis.yml to version generated by Pkg.generate

Folllowing a discussion on the mail-list, I have updated .travis.yml
to be compatible to the one generated by Pkg.generate(...). Hopefully,
everything will still work.