Allow DataFrame.aggregate to accept None for no grouping
#527
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| -9s | |
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| 11m 55s | |
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| 8m 55s | |
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| 9m 55s | |
| 13m 51s | |
| 14m 18s | |
| 0s | |
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| 54s | |
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| 1m 4s | |
| 4m 33s | |
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| 2m 53s | |
| 4m 4s | |
| 3h 2m 48s |