DOC: update bento docs (close #2993).
Update numpy/lib/function_base.py

fix percentile docstring
Merge pull request #2996 from andreas-h/patch-1

Update numpy/lib/function_base.py
BUG: Fix regression of bad error/random behavior in item method

Appearently .item() for arrays with size != 1 correctly returned an error
in 1.6., but failed to raise the error (due to missing return) in 1.7.
Merge pull request #3006 from seberg/fix-empty-item

BUG: Fix regression of bad error/random behavior in item method