Before anyone can contribute you should clarify some details about this repo. At first the licensing issue mentioned in #1 and #2, why would anyone contribute under such shady terms given by the CC license? If I fork the repo and make changes to it, I'm already violating the license, since my fork is a forbidden derivative.
Secondly, is this an active repo, the so called "master" branch, where the actual development is being made or is it just a dump from you own svn? Will the code stay as it is, or will you update it even if this is only a mirror repo, not the master?
Is this repo going to be maintained, is anyone ever going to read and reply to this issue ticket or not?
If the license is a small tööõnnetus and will be replaced with GPL (or better yet, with MIT/BSD) and you are actually going to maintain the repo, then welcome to the open source development community. I'm sure a lot of people would love to help you out with the code, whic currently does not look very good (no tests, no docs, no code comments, no nothing - and thus, not very trustworthy).
If the repo is going to stay as it is, then I don't see any point of releasing it at all. Noone can't contribute (forking and modifying, which is needed for contribution is prohibited), no one can understand (there's no docs) and no one can trust it (there is no tests).