Move overlap functions in geometry package
Adding __init__.py for geometry subpackage
Change aperture.py to use geometry sub-package
Removing duplicate functions
Place for geometry docs
Adding more docs to circular_overlap_grid
Adding more docs to elliptical_overlap_grid
Adding __all__
adding calling sequence
Changing link
Merge pull request #99 from bsipocz/create_geometry_package

Create geometry sub-package
Fixing subpixel in benchmark
Simplify scale_img calling sequences
Update docs in aperture plot()
Merge pull request #118 from bsipocz/benchmark_fix_subpixel

Fixing subpixel in benchmark
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