Python: Auto-detect nested lists and nested numpy arrays in Pandas

[asfimport]

Currently a user needs to specify an Arrow schema to indicate that a specific column has nested lists, while not simple we should add some auto-detection code for this.

Reporter: Uwe Korn / @xhochy
Assignee: Uwe Korn / @xhochy

Related issues:

• Arrow 0.5.0 release (blocks)

_{Note: This issue was originally created as ARROW-575. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
@xhochy can this move to 0.6.0?

[asfimport]

Uwe Korn / @xhochy:
@wesm I'll take a shot at this now, I need it in the next release.

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 847
#847