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closes #66

This was the version that introduced the crossmatch function.

The function `ligo.skymap.postprocess.find_injection.find_injection_moc`
was renamed to `ligo.skymap.postprocess.crossmatch.crossmatch`.

- ra: sexagesimal hours, minutes, and seconds
- dec: sexagesimal degrees, minutes, seconds
- a, b, pa: decimal degrees to the nearest hundredth of a degree,
  which is slightly less than arcminute precision

This reverts commit 880581d3

Fixes #64.

(cherry picked from commit 0fb2faec)