replaced lowess and tests
renames lowess.pyx -> smoothers_lowess.pyx
keep old lowess.py; replace only smoothers_lowess
revise imports in test_lowess.py
revise imports in test_lowess.py
test/warnings for deprecation
test/warnings for deprecation
ENH: add cython smoothers_lowess to setup.py
DOC/STY: update docstring import, whitespace/tabs cleanup
REF remove old lowess.py again (was readded during rebase)
REF ammend last commit, remove lowess from unit tests
py3 dots in imports
REF: python 3 compatibility use "rb" in genfromtxt
REF prefix underline for smoothers_lowess.pyx
REF: new wrapper function around lowess extension
TST add unittests, for changes with index order, is_sorted, and nans
REF: add missing keyword, more unittests
DOC: naming_conventions start Options section
REF: add return_sorted=True, back to old behavior by default
TST add test for graphics regressionplots add_lowess