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