index into multi-index past the lexsort depth
BUG: missing nose import for skip test

nose.SkipTest used but nose not imported.

Import nose at top level and use that throughout.
Merge pull request #8867 from matthew-brett/missing-nose-import

BUG: missing nose import for skip test
Merge branch 'mi-key-loc' of https://github.com/behzadnouri/pandas into behzadnouri-mi-key-loc
TST: provide a clear argument to assert_produces_warning to guarantee that we are clearing
     specific warnings before trying to catch them (in case they have already happened)
     requires the user to specificy the exact class where they are coming
DOC: Add where and mask to API doc
DOC: Add Nano to offsets table
Merge pull request #8879 from sinhrks/nanodoc_2

DOC: Add Nano to offsets table
Merge pull request #8876 from sinhrks/doc_where

DOC: Add where and mask to API doc