v4.3.2

• Performance: Reduce memory allocations (#2056)

v4.3.1

• Backport of bugfix to remove_column, so it works in Rails 3 and 4
  c740fb1
• Fix GeometryParser regex for usage of '@>' flag
• url on a unpersisted record returns default_url
• spec deprecation warnings and failures
• README adjustments

v4.3.0

• Improvement: Update aws-sdk and cucumber gem versions.
• Improvement: Add length alias for size method in AbstractAdapter.
• Improvement: Removed some cruft
• Improvement: deep_merge! Attachment definitions
• Improvement: Switch to mimemagic gem for content-type detection
• Improvement: Allows multiple content types for spoof detector
• Bug Fix: Don't assume we have Rails.env if we have Rails
• Performance: Decrease Memory footprint
• Ruby Versioning: Drop support for 1.9.3 (EOL'ed)
• Rails Versioning: Drop support for 4.0.0 (EOL'ed)