BUG/ENH: cleanup for Timestamp arithmetic#8916

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shoyer wants to merge 4 commits intopandas-dev:masterfrom

shoyer:fix-timestamp-math

Commits on Nov 28, 2014

Commits on Nov 29, 2014

fixes for Timestamp/Timedelta comparison ops
shoyer
committed

Commits on Dec 6, 2014

WIP: terrible hack to attempt to fix dt comparisons
shoyer
committed