Add pip requirements file for pyspark dependencies#1

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buckhx wants to merge 6 commits intopalantir:masterfrom

Commits on Feb 18, 2015

added requirements file to pyspark
buck heroux
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tarfile has no contextmanager in python2.
buck heroux
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Commits on Feb 19, 2015

reqs fix
buck heroux
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temp tar file
buck heroux
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Commits on Mar 5, 2015

bubbled up try finally
buck heroux
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forgot to remove
buck heroux
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