fix the "gc state" warning

src/Connector.js

@@ -202,7 +202,8 @@ export default function extendConnector (Y/* :any */) {
             if (!conn.isSynced) {
               // it is crucial that isSynced is set at the time garbageCollectAfterSync is called
               conn.isSynced = true
-              yield * this.garbageCollectAfterSync()
+              // It is safer to remove this!
+              // TODO: remove: yield * this.garbageCollectAfterSync()
               // call whensynced listeners
               for (var f of conn.whenSyncedListeners) {
                 f()
@@ -343,7 +344,8 @@ export default function extendConnector (Y/* :any */) {
               }
               defer.resolve()
             })
-            /* then apply ds
+            /*
+            then apply ds
             db.whenTransactionsFinished().then(() => {
               db.requestTransaction(function * () {
                 yield * this.applyDeleteSet(m.deleteSet)

src/Database.js

@@ -39,6 +39,7 @@ export default function extendDatabase (Y /* :any */) {
     */
     constructor (y, opts) {
       this.y = y
+      opts.gc = opts.gc === true
       this.dbOpts = opts
       var os = this
       this.userId = null
@@ -121,7 +122,7 @@ export default function extendDatabase (Y /* :any */) {
       this.startRepairCheck()
     }
     startGarbageCollector () {
-      this.gc = this.dbOpts.gc == null || this.dbOpts.gc
+      this.gc = this.dbOpts.gc
       if (this.gc) {
         this.gcTimeout = !this.dbOpts.gcTimeout ? 50000 : this.dbOpts.gcTimeout
       } else {