New upstream version

• Updating url from watch file to https://github.com/berkshelf/solve/tags
• Update upstream version to 4.0.4-1
• Fix ruby-dependecies
• Update Standards-Version

I tried to build and I notice some infos lintian about the patches, I don't know if everything is alright about this, but I followed http://honk.sigxcpu.org/projects/git-buildpackage/manual-html/gbp.patches.newupstream.html.