#22 removing source dependency

[LGLO]

I think we don't need any scalaz dependency to compile project ATM.
I removed source dependency to let the project build.
Closes #22.

[GrafBlutwurst]

👍 solved the issue of the missing snapshot dependency for me

[vil1]

LGTM.
We don't use any of scalaz yet, but we'll soon need to add the dependency back later (but as a binary one)
I won't close #23 though, since I'd like the source dependency toward the scalaz-sbt plugin to be changed to binary as well (which is blocked until scalaz/scalaz-sbt#20 is fixed)