Github Blame Tool

Brings better blame traversal links to github's blame and commit pages.

Github is a great tool, but it could use a few better links to blame views. On a blame page, beside every short commit hash, you'll see a < and a |, which link to a blame of that file from the commit before that hash and that hash, respectively. On a commit blob page, every file now also has a button linking to a "Previous Blame" view and a "Blame" view, that open that file up in blame mode either at the commit previous to the blob you're examining, or at the current commit. Sometimes, an edit to a file will have been made at a commit prior to a rename of that file. If you're looking at a blame of the file after it's been renamed, you won't be able to jump straight to the blame of the file before it was renamed. You will instead have to follow the commit link for that change, and then on the commit page (which will show the original file), navigate to a blame on _that_ file. If you have any questions or comments, feel free to contact me at carss.w@gmail.com. Also, if this somehow breaks something for you, you're the only one responsible for it.