Remove dependency on plugin lein-protobuf

[cesarbp]

I removed the dependency on lein-protobuf. Compiled al the .proto files (including the tests) and placed them in a separate clojars repo. This is so users are not forced to download and compile protoc when they don't need it. This should also make this library work on windows.

I deleted the .proto files. I think they should be in their own project.