Add version so bower will work

Currently bower install fails due to the lack of a version. This should fix that (maybe it is still needed to provide a git tag named `0.0.0` in the repo, this to be discovered).
Version set to 0.0.0 to make it clear it's a never-changing dummy version as Lea wished. :)
Merge pull request #169 from anselmh/patch-1

Add version so bower will work