Added Vixen scraper. Added LegalPorno studio IDs.

src/scrapers/index.js

@@ -5,6 +5,7 @@ const julesjordan = require('./julesjordan');
 const kink = require('./kink');
 const legalporno = require('./legalporno');
 const pervcity = require('./pervcity');
+const vixen = require('./vixen');
 
 module.exports = {
     xempire,
@@ -12,4 +13,5 @@ module.exports = {
     kink,
     legalporno,
     pervcity,
+    vixen,
 };