Merge pull request #59 from william-g-vaughan/master

add In filterfunc and tests; update .gitignore to remove eclipse-related...
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Merge pull request #60 from matthayes/master

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[ci skip]
Fix BagLeftOuterJoin log spam
Coalesce should cast types where possible
Merge branch 'master' of github.com:linkedin/datafu
Add EmptyBagToNull
Add strict and lazy options for Coalesce
Fix coalesce date tests
Merge pull request #61 from matthayes/master

Coalesce should merge types where possible, add EmptyBagToNull