Misc updates to eliminate accidental geth imports

core/interface.go

@@ -158,4 +158,16 @@ type Logger interface {
 
 type PluginLoader interface {
 	Lookup(name string, validate func(interface{}) bool) []interface{}
+	GetFeed() Feed
+}
+
+
+type Subscription interface {
+	Err() <-chan error // returns the error channel
+	Unsubscribe()      // cancels sending of events, closing the error channel
+}
+
+type Feed interface {
+	Send(interface{}) int
+	Subscribe(channel interface{}) Subscription
 }

core/types.go

@@ -89,11 +89,6 @@ type NewTxsEvent struct{
   Txs [][]byte // []RLP encoded transaction
 }
 
-type Subscription interface {
-	Err() <-chan error // returns the error channel
-	Unsubscribe()      // cancels sending of events, closing the error channel
-}
-
 type API struct {
 	Namespace string
 	Version   string