bump swig version

Any chance we can bump the package.json to use a newer version of SWIG? Tests all pass still. There seems to have been some updates with the template loaders between ~1.1.0 and ~1.3.0. I'm not sure you could set additional template paths in ~1.1.0. I've been using `npm shrinkwrap` to overcome this but I figure it makes sense for this to make its way back into the official project.