Log Message:
Update to 1.708

Upstream changes:
1.708     2015-11-01 14:33:27-05:00 America/New_York
        [MAYBE JUST POSSIBLY A BREAKING CHANGE]
        - ...but probably not
        - fix the <=> operator to behave more predictably
        - now implemented in terms of ==, <, and >
        - thanks, Karen Etheridge!

1.707     2015-07-17 20:36:41-04:00 America/New_York
        - do not lose a min or max of 0 when intersecting two tolerances
          (thanks, Michael Carman!)