add "-full-scan" scan option to gonic scan

closes #20

server/ctrladmin/handlers.go

@@ -272,7 +272,7 @@ func (c *Controller) ServeUpdateLastFMAPIKeyDo(r *http.Request) *Response {
 func (c *Controller) ServeStartScanDo(r *http.Request) *Response {
 	defer func() {
 		go func() {
-			if err := c.Scanner.Start(); err != nil {
+			if err := c.Scanner.StartInc(); err != nil {
 				log.Printf("error while scanning: %v\n", err)
 			}
 		}()

server/ctrlsubsonic/handlers_common.go

@@ -86,7 +86,7 @@ func (c *Controller) ServeGetMusicFolders(r *http.Request) *spec.Response {
 
 func (c *Controller) ServeStartScan(r *http.Request) *spec.Response {
 	go func() {
-		if err := c.Scanner.Start(); err != nil {
+		if err := c.Scanner.StartInc(); err != nil {
 			log.Printf("error while scanning: %v\n", err)
 		}
 	}()

server/server.go

@@ -208,7 +208,7 @@ func (s *Server) StartScanTicker(dur time.Duration) (funcExecute, funcInterrupt)
 			case <-done:
 				return nil
 			case <-ticker.C:
-				if err := s.scanner.Start(); err != nil {
+				if err := s.scanner.StartInc(); err != nil {
 					log.Printf("error scanning: %v", err)
 				}
 			}