CustomKernel fixes
Added CustomKernel tests for zero-summed kernels.
Merge pull request #2088 from mdboom/testing/commandline-help

Clean up `setup.py test --help`
updated changelog
updated changelog
updated changelog
Merge pull request #2097 from mdboom/wcs/read-out-of-bounds

Fix read out of bounds error in `wcs`
Fix test failures on Windows. The previous code was incorrectly using compression=False/True, when in fact the compression argument should not be specified for no compression (otherwise False is interpreted as 0, the gzip compression level).
changed to np.isinf
Merge pull request #2016 from larrybradley/kernels

CustomKernel fixes
Merge pull request #2099 from astrofrog/hdf5/fix-windows

HDF5 I/O tests fail on Windows 7 Anaconda installation
Make -t work for .rst files.
Update command line help for -t
Reorganize testing code.  Document the ``-t`` option.