Changed to not install with sudo.
Changed to not run unit tests.
Added newer versions of scipy, numpy, and pyyaml.
Merge pull request #2 from csdms/add-travis-support

Travis now successfully builds the coupling dependencies. Namely, ESMF and ESMPy. Note that the unit tests are *not* being run yet.
Merge branch 'master' into fix-unit-tests

Conflicts:
	.travis/install_python.sh
Activate the python virtual environment before testing.