Update astropy_helpers to v0.4
Use ah_bootstrap.py from astropy-helpers v0.4
Aperture photometry returns a Table as output
Changing tests
Fix doc examples to get doctest pass
Change output column name, add versions to metadata
Adding FLOAT_CMP to doctests
Change back output column name
Updating start page example
Fixing broken link
Changing assert to assert_allclose
Minor docs modification
Changing column names to aperture_sum and aperture_sum_err
adding unit=None in cases when data has no unit
adding do_photometry as aperture member, first draft
Changing benchmark to fit recent changes
Some speed up of do_photometry
adding do_photometry as aperture member in circ_annulus
updating benchmark
Fixing center method