opt: main page, add polyline api, add back to launcher logic; bugfix: map resume when back to mainactivity

libraries/mogo-map-api/src/main/java/com/mogo/map/IMogoMap.java

@@ -2,6 +2,8 @@ package com.mogo.map;
 
 import com.mogo.map.marker.IMogoMarker;
 import com.mogo.map.marker.MogoMarkerOptions;
+import com.mogo.map.overlay.IMogoPolyline;
+import com.mogo.map.overlay.MogoPolylineOptions;
 import com.mogo.map.uicontroller.IMogoMapUIController;
 
 import java.util.ArrayList;
@@ -127,4 +129,12 @@ public interface IMogoMap {
      * @return
      */
     float getZoomLevel();
+
+    /**
+     * 添加线段
+     *
+     * @param options
+     * @return
+     */
+    IMogoPolyline addPolyline( MogoPolylineOptions options );
 }