Added twig filter to edit the source url

Added a twig filter to turn urls like `git@bitbucket.org:Comapny/repo.git` into `http://bitbucket.org/Comapny/repo.git`

Without this fix, the link to any release would be `http://satis-domain.com/git@bitbucket.org:Comapny/repo.git`. 
Thank you @kaiwa that works. 
But you would still have a lot of useless links. 

Each and every version of this package has a link to: `http://packages.domain.com/git@bitbucket.org:company/special-bundle.git`

![screen shot 2014-07-23 at 15 10 38](https://cloud.githubusercontent.com/assets/1275206/3673269/0e584492-126b-11e4-881c-9ebc2e97f57d.png)

The link is broken (of course). What are the purpose of that link? Should they all be removed?