set parquet version to 1.4.0
Merge pull request #840 from epishkin/parquet_1.4.0

set parquet version to 1.4.0
Fix performance regression Avi noticed
Merge pull request #841 from twitter/keyed-list-like-megatypes

Fix performance regression Avi noticed
Bump version to 0.9.1
Merge branch 'release/0.9.1' into develop