revisit linting noqas

spglm/spglm/glm.py

Line 343 in 4d435f7

model = self.model # noqa F841 - `model` never used
spglm/spglm/base.py

Line 309 in 4d435f7

dot_fun = nan_dot # 5F6A noqa F821 - `nan_dot` not defined - should remove
spglm/spglm/utils.py

Line 23 in 4d435f7

string_types = basestring # noqa F821 - `basestring` not defined - should remove
spglm/spglm/varfuncs.py

Line 120 in 4d435f7

from statsmodels.tools.numdiff import approx_fprime_cs # noqa F401

xref #37

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