This adds support for Travis CI and SauceLabs
testing.  Testing on SauceLabs in done via
the Karma test runner.  Note that encrypted
Sauce username and access key values need
to be inserted into .travis.yml as global
environment variables.  Additionally, the
local test runner (which is still useful
for debugging tests and code) was updated
to reflect that the 'node_modules' folder
now gets placed in the root directory.