Adapted (but very updated) from:
http://blog.firsthand.ca/2010/10/installing-redmine-on-heroku-with-s3.html
http://blazingcloud.net/2010/06/18/deploying-a-redmine-wiki-to-heroku/
- Import the latest trunk from svn to git (since we're not concerned with all the branches and tags, we don't need to use svn2git tool)