Revert Timo Furrer commits as they break multiple buffers represantation

![img](https://raw.github.com/aot9/vim-bufferline/master/img1.jpg)
![img](https://raw.github.com/aot9/vim-bufferline/master/img2.jpg)
![img](https://raw.github.com/aot9/vim-bufferline/master/img3.jpg)