Reactivating tests

Trying to switching back working tests. At the present time only test_wsdl with some wsdl from xmethods are working:
* reorganizing directories to separate tests from source (works better with coverage
* coverage, travis and coveralls included
* switching to tox and nose to test multiple python version

Few notes:
* a check is needed to see if package is correctly made
* i'm looking for non-corrupted xmethods.tar.gz and globus.tar.gz files