Add mad_std function
Add fwhm_to_sigma and sigma_to_fwhm functions
Implement @embray's comments
Prepend "gaussian_" to FWHM <-> sigma conversion functions
Added instructions on setting up affiliated package manually
Added section on updating for manual set-up
Added instructions on updating astropy-helpers
Mention ah_bootstrap.py
Implemented comments by @cdeil
Javascript magic to allow user to specify package name
Fix warning
Fix typo [ci skip]
Added notes about editing files
Added note about setup.py commands not working until first commit
Add a new decorator for functions accepting quantities.
Improve quantity decorator and add tests.
Change the decorator to use Python 3 annotations.
Tidy up and write tests in both py2 and py3 syntax
Use inspect.signature instead, currently no py2 support.
move to extern funcsigs