v0.3.7

TimeSpans v0.3.7

Diff since v0.3.6

Closed issues:

• user-selectable rounding strategies for time <-> index conversion? (#26)
• time_from_index of a range is inconsistent depending on the length of the range (#45)

Merged pull requests:

• Backport invert_spans fix to release-0.2 (#54) (@ararslan)
• invert_spans when all spans lie outside of parent (#56) (@palday)