Keyboard Shortcuts to Close Other/Right Tabs

Chrome extension adding shortcuts for closing and pinning tabs.

The extension consists of three keyboard shortcuts: * Alt-Shift-O: Close Other Tabs * Alt-Shift-R: Close Tabs to the Right * Alt-Shift-P: Pin Tab Note: A separate extension, tabloid, adds the following shortcuts to Chrome * Move Tab Right * Move Tab Left * Move Tab to First Position * Move Tab to Last Position Chrome extensions currently only allow for a maximum of four shortcuts, which is why they are not included in tabasco. You can fetch tabloid here: https://chrome.google.com/webstore/detail/femidpfpildjfepkcaodpalpakgadjih