FIX: Fix antialiasing
ENH: Even better sampling
ENH: Generalize concentric circles
FIX: Fix config
FIX: Fix config
STY: Better doc
FIX: Address comments
FIX: Fix errant change
Merge pull request #128 from Eric89GXL/fix-aa

FIX: Fix antialiasing
FIX: Fix unit passing
Merge pull request #131 from Eric89GXL/fix-units

FIX: Fix unit passing