restore throttling limit instead of changing the limit in the tests travis CI allows to specify a maximum number of concurrent test runs. Setting that limit to 1 resolves the test issues. Also, added throttling protection to the vision tests.
restore throttling limit
instead of changing the limit in the tests travis CI allows to specify a maximum number of concurrent test runs. Setting that limit to 1 resolves the test issues. Also, added throttling protection to the vision tests.

cicorias/project-oxford,cthrash/project-oxford,felixrieseberg/project-oxford