v1.3.8-rc38

JSON API Changes

• BREAKING JSON CHANGE: pngquant encoder preset now has separate fields for quality and minimum_quality instead of expecting a 2-element array for the quality field.

Querystring API Changes

• BREAKING: Change &webp.quality default to 80
• Fix transposed &anchor= command in querystring API. topright was acting like bottomleft, etc.
• Add &png.lossless=true command to offer explicit control in the presence of png.quality (non-breaking change)

Other changes

• Add internal-only enable_transparency node to enable the transparency channel on a jpeg image. Used by Alpha node and expand_canvas so that transparency now works even if
• Add docs for all nodes
• Update dependencies