changed travis.yml from "python" to "nosetests"
changed travis.yml from "python" to "nosetests"

“nosetests -vv abel/tests” should do the  same thing as “python  -c
"import abel.tests; abel.tests.run_cli(coverage=True)””

PyAbel/PyAbel,stggh/PyAbel,huletlab/PyAbel,rth/PyAbel,DhrubajyotiDas/PyAbel