fix issue #8000 - interpolation extrapolates over trailing missing values#8013

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grahamjeffries wants to merge 2 commits intopandas-dev:masterfrom

grahamjeffries:master

Commits on Aug 12, 2014

changes to avoid extrapolating over missing data
grahamjeffries
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Commits on Aug 13, 2014

test that interpolate doesn't extrapolate
grahamjeffries
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