Replace jshint with eslint and add lots of rules

Fix eslint errors accordingly

lib/utils.js

@@ -2,7 +2,7 @@
 
 // hgetall converts its replies to an Object. If the reply is empty, null is returned.
 // These function are only called with internal data and have therefor always the same instanceof X
-function replyToObject(reply) {
+function replyToObject (reply) {
     // The reply might be a string or a buffer if this is called in a transaction (multi)
     if (reply.length === 0 || !(reply instanceof Array)) {
         return null;
@@ -14,7 +14,7 @@ function replyToObject(reply) {
     return obj;
 }
 
-function replyToStrings(reply) {
+function replyToStrings (reply) {
     if (reply instanceof Buffer) {
         return reply.toString();
     }