COMPAT: msgpack on windows 3.5 failing oddly
@kawochen just updated the appveyor support (was not really running correctly before).

in [here](https://github.com/pydata/pandas/commit/5b84e49e44cb378cee211436f0966e53d89b08b1)

2.7 fully passes and 3.5 does except for some of these odd MemoryErrors, must be some sort of recursion issue, see build [here](https://ci.appveyor.com/project/jreback/pandas/build/1.0.1526/job/0meym8xg4j0bh9ea)

I cannot reproduce these locally, only on appveyor, any thoughts?
