TST/STYLE: remove multiprocess nose flags and slight PEP fixes
https://github.com/pandas-dev/pandas/pull/13856#issuecomment-278058522
I ended up having to autopep8 things to remove the extra lines when I took out the multiprocessing directive. But seems to pass and all be good. Slight PEP is even on non-qa files (some aspects of them).

@jorisvandenbossche @TomAugspurger @bashtage  This will not conflict with Tom's pytest PR? I just did a test rebase on top of this, and didn't have to resolve any conflicts. Haven't looked at the new diff yet though. @jreback The test files are not tested for PEP8 on travis? And would they pass now with those changes? i am not 100% sure we are testing ALL files (that's why some things were changed)

everything passes now but let me see if i can add the other files actually I think the slight peps are to files what we ignore flake on. so pretty innocuous.