Remove non-conda CI builds and simplify .travis.yml structure.
Remove non-conda CI builds and simplify .travis.yml structure.

ContinuumIO/dynd-python,insertinterestingnamehere/dynd-python,izaid/dynd-python,mwiebe/dynd-python,ContinuumIO/dynd-python,izaid/dynd-python,mwiebe/dynd-python,insertinterestingnamehere/dynd-python,izaid/dynd-python,mwiebe/dynd-python,ContinuumIO/dynd-python,ContinuumIO/dynd-python,insertinterestingnamehere/dynd-python,insertinterestingnamehere/dynd-python,izaid/dynd-python,mwiebe/dynd-python