Luakit 2.0

Remove the two if unique then ... end blocks from your rc.lua.
Add require "unique_instance" to your rc.lua, before all other require statements.
Remove all configuration files except rc.lua and theme.lua. Any changes to globals.lua need to be migrated to rc.lua and changed to use the settings API.

Added styles.new_style function.
Added styles.toggle_sheet function.
Added styles.watch_styles function, and enabled live-editing of user styles.
Added luakit.install_paths table. luakit.install_path is now deprecated.
Added Control-Y readline binding.
Added ability to control whether links from secondary instances open in a new window.
Added luakit.resource_path property to control where luakit searches for resource files.
Added lousy.util.find_resource function.
Added scroll signal.
Added ability to bind actions to webview scroll events.
Added ability to set the default zoom level.
Added webview widget "permission-request" signal.
Added webview widget hardware_acceleration_policy property.
Added webview widget allow_file_access_from_file_urls and allow_universal_access_from_file_urls properties.
Added settings module and APIs. This replaces the domain_props module.
Added tablist.always_visible setting.
Added utf8.len (same as string.wlen) and utf8.offset methods.
Added utf8.charpattern property.
Added :set and :seton commands, for changing settings.
Added ability to always save session before exiting luakit.
Added markup option to window set_prompt() method.
Added detach-tab signal.
Added support for multi-byte characters in hints.
Added widget replace method.

It is no longer necessary to add bindings to tables with lousy.bind.add_binds().
Readline bindings have been moved to readline.lua.
Readline bindings are now automatically bound when the input bar is visible.
Unique instance support has been moved to unique_instance.lua.
The image widget now uses luakit.resource_path to locate local files.
The log viewer now shows errors logged by a user-defined rc.lua failing to load.
Luakit will now remove its IPC socket file before restarting.
The editor command now defaults to using xdg-open to edit files. The default builtin command has been renamed autodetect.
Changed luakit://introspector/ to luakit://binds/.
URL completion now uses word-based fuzzy matching.
:download now uses the current page URI by default.
gy now accepts a count.
:tabopen will now only open local files when given an absolute path.
:styles-list now lists active styles first and disabled styles last.

Removed domain_props module. It is replaced by the settings module and its APIs.
Removed all configuration files except rc.lua and theme.lua.
Removed enable_private_browsing webview property.
Removed w.closed_tabs field. It is now private to the undoclose module.

Fixed luakit://help/ not finding documentation with custom DOCDIR
Various minor documentation fixes.
Fixed Control-Scroll and Shift-Scroll key bindings not working with smooth scrolling.
Fixed inability to switch focus between web page elements with Tab and Shift-Tab.
Fixed log page bug when logging messages with newlines.
Fixed Up and Down keybindings being broken on completion menu.
Fixed hardcoded path to luakit icon.
Fixed luakit:// pages not working and spewing errors when not using LuaJIT.
Fixed thumbnail hinting not retrieving thumbnail links correctly.
Fixed inability to bind Modifier-Minus.
Fixed readline handling of wide characters.
Fixed completion not suggesting history/bookmarks items without titles/tags.
Fixed :dump command not working due to use of a removed API.
Fixed follow hints being sometimes truncated by the viewport edge.
Follow mode now renders hints much faster.
Fixed Forward/Back keys not working due to outdated bind syntax.
Fixed opening local files with names containing spaces from :tabopen and the command-line.