doctest-skip directive isn't working in docstrings

[pllim]

Moved from astropy/astropy#3948 . Originally posted by @bsipocz on July 12, 2015.

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Is there a way to enable the directive to work in the docstrings, too?

It works fine in the docs rst files, but apparently not in the docstrings as I get this fail with ccdproc:
https://travis-ci.org/astropy/ccdproc/jobs/70630227

[bsipocz]

@tinumide - I think this may also be a side effect for the new directive you work on. While the docstring examples for astroquery are a lower priority than the narrative documentation, getting the bottom of this may be a good enough coding stretch goal for later.

cc @ceb8

[bsipocz]

We run into this again last week while updating np docstrings, it would be a really nice feature to have