Rename package to "node-raylib"

[RobLoach]

Since this is a Node addon, it would make sense to rename the package itself to node-raylib. Similar to how the sass node addon is called node-sass.

[konsumer]

I think the reason node-sass is named that way, is because it makes a CLI tool, but the original CLI is in another language (and original npm sass package uses that.)

There are tons of examples that don't have the prefix, because the node- part is implied (as it is the npm library connector for the library) but honestly it does't super-matter to me.

[konsumer]

Looks like now the original is dart compiled to native js, but it used to be ruby or C or something.