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ARROW-1342: [Python] Support strided ndarrays in pandas conversion from nested lists

This does drop the vector append to the builder that was there before. I'm going to do some local benchmarking to make sure this doesn't degrade performance unacceptably, will report back here

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #956 from wesm/ARROW-1342 and squashes the following commits:

f2ebeba8 [Wes McKinney] Fix cpplint issue
f403f9dd [Wes McKinney] Fix test case to be platform independent, note ARROW-1345. Improve quality of error message
f4f44c18 [Wes McKinney] Fix test case where inferred list type is null
ae5c8312 [Wes McKinney] Drop striding check
b4aecd3a [Wes McKinney] Support strided ndarrays in pandas conversion from nested lists