• Added more integration tests for file APIs.
• Fixed mounting invalid bucket issue: #770
• Added unix socket support for token-url.
• Fixing Integration Test Related to Relative Log/Key File Path
• Add flag to have ability to not cache Token from token-url
• Tested and changed experimental-stackdriver-export-interval flag to stackdriver-export-interval. See https://github.com/GoogleCloudPlatform/gcsfuse/blob/master/docs/metrics.md on how to use this flag.