Run exporter in goroutine

Use channel to pass data from exporter to importer

models/models.go

@@ -64,3 +64,31 @@ type Love struct {
 	RecordingMbid MBID
 	RecordingMsid MBID
 }
+
+type ListensList []Listen
+
+func (l ListensList) Len() int {
+	return len(l)
+}
+
+func (l ListensList) Less(i, j int) bool {
+	return l[i].ListenedAt.Unix() < l[j].ListenedAt.Unix()
+}
+
+func (l ListensList) Swap(i, j int) {
+	l[i], l[j] = l[j], l[i]
+}
+
+type LovesList []Love
+
+func (l LovesList) Len() int {
+	return len(l)
+}
+
+func (l LovesList) Less(i, j int) bool {
+	return l[i].Created.Unix() < l[j].Created.Unix()
+}
+
+func (l LovesList) Swap(i, j int) {
+	l[i], l[j] = l[j], l[i]
+}