code: function(context, childPkg){
  		var curAddress = childPkg.origFileUrl;
  		var parentAddress = utils.path.parentNodeModuleAddress(childPkg.origFileUrl);
  		while(parentAddress) {
  			var packageAddress = parentAddress+"/"+childPkg.name+"/package.json";
  			var parentPkg =	context.paths[packageAddress];
  			if(parentPkg && SemVer.valid(parentPkg.version)) {
  				if(SemVer.satisfies(parentPkg.version, childPkg.version)) {
  					return parentPkg.fileUrl;
  				} else {
  					return curAddress;
  				}
  			}
  			parentAddress = utils.path.parentNodeModuleAddress(packageAddress);
  			curAddress = packageAddress;
  		}
  		return curAddress;
  	}
docs: Walk up the parent addresses until you run into the root or a conflicting
  package and return that as the address.