[Python] Serialize timedelta64 values from pandas to Arrow interval types

[asfimport]

This work is blocked on ARROW-835

Reporter: Wes McKinney / @wesm

Related issues:

• [Format] Add Timedelta type to describe time intervals (is blocked by)

_{Note: This issue was originally created as ARROW-2625. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
PyArrow serialization, closing as won't fix.