Log Message:
Update to 1.64

Upstream changes:
1.64     2016-02-21

- Changed how a string that contains separate epoch and nanosecond fields is
  turned into a DateTime object in order to deal with changes coming in the
  next DateTime release.

1.63     2016-01-13

[BUG FIXES]

- The behaviour of silently ignoring text after the matching part was
  lost in the rewrite. This has been restored. Patch by Dagfinn Ilmari
  Manns疇ker. RT #111155.

1.62     2015-12-19

[BUG FIXES]

- When on_error was set to something that did not die (including the default
  error handling), calling ->parse_datetime with some bad inputs could cause
  the module to error out internally by trying to call methods on an undefined
  value instead of returning undef. Reported by Mike Dorman. RT #110247.