FIX: interesction and union changed index names. fixes #9943 partly #9862#9965

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hsperr wants to merge 3 commits intopandas-dev:masterfrom

hsperr:index_names

Commits on May 17, 2015

FIX: interesction and union correct name chaning behavior. fixes #9943 partly #9862
hsperr
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FIX: Reworked the tests, removed the equal None
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Commits on Jul 18, 2015

FIX: more shortpaths, refactor tests
hsperr
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