Fixes

* Make `express-minify` an optional dependancy as we only use it in production and it requires a compiler to install (pain). Also make `morgan` optional even though it doesn't need a compiler. I could probably make it a `devDependancy` but it's not terribly critical (as we might want to use it in production).
* Remove Icons from non `https://` or `data:image/` URIs (png/gif only atm, probably should add jpg or just allow anything).