Removing/Deleting bookmarks

This is one feature I would have requested but thought I'd rather implement it myself. I ain't sure, the functions I've used are the best for this job, but they pretty much do what I wanted.

Here's a screenshot
![screenshot from 2013-05-26 17 00 53](https://f.cloud.github.com/assets/1612564/565255/f38d9c9a-c5f7-11e2-9359-8cb9f4d45f78.png)