Fix travis command to check dartfmt
Fix travis command to check dartfmt

The `.` directory doesn’t work, because Flutter is installed in it, so we’re also checking `dartfmt` on all of Flutter (including files that purposefully have syntax errors, for testing).

Also, Travis doesn’t fail when just one script fails. The `travis_terminate 1` command should prevent that.

brianegan/scoped_model,brianegan/scoped_model,brianegan/scoped_model,brianegan/scoped_model