fix broken `gu` and `gU` bindings (see #73)
added missing commands to mappings page
move Bookmarks from background_scripts/main.js to background_scripts/bookmarks.js
move History from background_scripts/main.js to background_scripts/history.js
move Clipboard from background_scripts/main.js to background_scripts/clipboard.js
move Sites from background_scripts/main.js to background_scripts/sites.js
move Files from background_scripts/main.js to background_scripts/files.js
move Links from background_scripts/main.js to background_scripts/links.js
clean up initialization in background_scripts/main.js
missing semicolon in background_scripts/history.js
update manifest.json
Fixed an issue with the change from double to single quotes + fixed multiyank