Update smartrtbBidAdapter (prebid#4362)

* modules: Implement SmartRTB adapter and spec.

* Fix for-loop syntax to support IE; refactor getDomain out of exported set.

* Remove debugs, update doc

* Update test for video support

* Handle missing syncs. Add video to media types in sample ad unit

* Add null response check, update primary endpoint

* Note smrtb video requires renderer

* Remove old params checks, fix documentation playerSize field name

modules/smartrtbBidAdapter.js

@@ -17,11 +17,8 @@ function getDomain () {
 export const spec = {
   code: BIDDER_CODE,
   supportedMediaTypes: [ 'banner', 'video' ],
-  aliases: ['smrtb'],
   isBidRequestValid: function(bid) {
-    return (bid.params.pubId !== null &&
-      bid.params.medId !== null &&
-      bid.params.zoneId !== null);
+    return (bid.params.zoneId !== null);
   },
   buildRequests: function(validBidRequests, bidderRequest) {
     let stack = (bidderRequest.refererInfo &&

modules/smartrtbBidAdapter.md

@@ -24,7 +24,7 @@ Video is supported but requires a publisher supplied adunit renderer at this tim
                    },
                    video: { /* requires publisher supplied renderer */
                        context: 'outstream',
-                       playerDimension: [640, 480]
+                       playerSize: [640, 480]
                    }
                },
                bids: [