Fix build

The following changes are needed to fix the build for a clean checkout on Ubuntu 13.04. 1.1-SNAPSHOT correctly resolves but has a hardcoded dependency on a SpecialSource 1.6-SNAPSHOT, which does not currently exist. Furthermore, the output from the obfuscate step does not correctly get mapped to the input name expected by overmapped, so those need to be changed as well.

I admit to not being fully understanding of the maven build system, as well as the library dependencies here. However, I inspected the error messages and browsed http://oss.sonatype.org/content/groups/public/net/md-5/ as best as I could to figure things out.