Update ruby-block to fork on github

I've forked ruby-block from it's emacswiki page and made some changes to fix the highlighting when the cursor is behind an end. I know forks are discouraged, however this file hasn't seriously been updated on emacswiki for two years now, and it seems like emacswiki is discouraged. 

If this isn't the case, then I updated the emacswiki page as well, the changes should be there regardless.