issue #52: disable astropy's disabling of internet to run tests
issue #52: remove stray comment disabling fix
issue #52: support astropy v<0.4 with guarded import of disable_internet
issue #52: trying to fix suspected port collision problem with test server
issue #52: port collision prob: use mitigation in test scripts
issue #52: port collision prob: debugging (may still have race cond.)
issue #52: port collision prob: still debugging (via Travis)
issue #52: port collision prob: added some message printing to server
Merge pull request #53 from RayPlante/astropydev

issue #52: disable astropy's disabling of internet to run tests.  This also required some extra coding to prevent some apparent port collisions when running several Travis test runs simultaneously.  The solution is likely not perfect but it appears to be standing up okay now.