add reader/index.html with reader.js

For https://github.com/futurepress/epub.js/issues/91, I created index.html under ./reader/, added URI.js under ./libs/ and copied other files from demo. 
Features required server side were hidden and "title-controls" was moved to the left because I think it's more user friendly. Bookmark button should be closed to the sidebar. 
BTW, I think it's not a good idea to disable readers to go forward when the sidebar is open.