Version 0.1.9

Version 0.1.9

Added S3 PathHandler
Some fixes

fbshipit-source-id: 0c513fd020a5aba0b7f2ca2d85b23c7e80469533

Version 0.1.8

Version bump to 0.1.8

Summary: ioPath version bump to 0.1.8

Reviewed By: sujitoc

Differential Revision: D27269584

fbshipit-source-id: e4d66bec0c4e6d712d38559cd1fc5b469ebe7e9b