Package naming

Maybe we can rename `SynthPop` to `synthpop` or `synth-pop` [here](https://github.com/UDST/synthpop/blob/d1de14a2d70a83d366294579f792e8b2ee1c9b9a/setup.py#L7).
Otherwise when creating Pypi package, it names it as `SynthPop 0.1.dev0` which is difficult to find since searching for _synthpop_ will throw no results. Same happens with the downloadable package name: `SynthPop-0.1.dev0.tar.gz`.
