DOC: Scipy links and more expanation
TST/CLN: Remove duplicated tests.

Add test for ValueError on non-timeseries time method.
CLN:  clean up bad rebase
DOC:  reindex interpolate example
TST: Move interp limit test to test_generic.
DOC: Fix formatting.
BUG:  Check for int.
TST: Raise ValueError
TST: Move fillna tests back to interpolate.