New features:

• Support for SSH Multi-Step authentication.
• Support for SSH user certificate authentication.
• Improved virtual folders support: you can now share a folder among users and define different folder quota limits for each user.
• Examples external auth programs for LDAP authentication.
• Added a pre-delete hook: you can implement features like a recycle bin.
• Various performance improvements.
• Built-in SCP implementation is now enabled by default.
• S3 upload part size and concurrency are now configurable.
• Support for several build tags: you can now disable, at build time, the features you don't need so they will not be included in the resulting binary.

This version uses a crypto/ssh fork to support the following features:

• SSH Multi-Step authentication (golang/crypto#130)
• AES-256-GCM cipher (golang/crypto#127)
• Performance improvements replacing Go sha256 with minio/sha256-simd