Allow comoving volume to accept arrays in non-flat case. Add unit test.
Fixes a minor issue in the tests where if run in a specific order the FitsHDU tests could fail due to modification of global state by one of the other tests.
Per https://github.com/astropy/astropy/pull/895#issuecomment-21372540 the '+ lensing' should be removed.
Merge pull request #1277 from aconley/comoving_volume_array

Allow comoving volume to accept arrays in non-flat case. Add unit test.
Merge pull request #1279 from iguananaut/fits-test-issue

Fix minor issue in fhe io.fits tests
Add changelog entry for #1277