Replace eval; deal with inf#134

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keflavich wants to merge 2 commits intodendrograms:mainfrom

keflavich:safe_eval

Commits on Oct 23, 2014

replace eval with ast.literal_eval and account for cases of inf, nan in
keflavich
committed

Commits on May 27, 2015

Merge remote-tracking branch 'upstream/master' into safe_eval
keflavich
committed