Adding comment
Now BSplineModel tests are ignored if astropy version is less than 0.4.x
Adding astropy-dev + scipy test in travis
Changing xrange to six.moves.xrange for 2to3 compatibility
Changing xrange to range because module six is not found
Merge pull request #77 from shaileshahuja/skip-tests

Need to skip some tests if astropy 0.3.x is being used