2.6.0

Major changes:

• Properly detects resolution levels in JP2 files, and reports scale factors accordingly
• Properly detects tile width and height, eliminating the need for manually specifying tiles on the command line
• Optionally caches data for info.json responses
• Adds the ability to override the IIIF info.json response per image
• Allows specifying configuration via /etc/rais.toml (see rais-example.toml)
• Allows limiting RAIS features via an IIIF capabilities file (see cap-max.toml
  and cap-level0.toml for examples)

Back-end improvements:

• Fixes init scripts for RHEL 6 users
• Uses Go 1.6 for the Docker build
• The build system now uses gb
• Visiting the server URL + "/version" will report the current version of RAIS