Significant changes

• A new fish_realpath builtin and associated function to allow the use of realpath even on those platforms that don't ship an appropriate command (#2932).
• Alt-# toggles the current command line between commented and uncommented states, making it easy to save a command in history without executing it.
• The fish_vi_mode function is now deprecated in favour of fish_vi_key_bindings.

Other notable fixes and improvements

• Fix the build on Cygwin (#2952) and RedHat Enterprise Linux/CentOS 5 (#2955).
• Avoid confusing the terminal line driver with non-printing characters in fish_title (#2453).
• Improved completions for busctl, git (#2585, #2879, #2984), and netctl.

The SHA-1 sum for the release tarball is 7b924b8b377950d4ee88a1b13dbce4d5b337e068.