fix build warning; update build scripts

.gitignore

@@ -0,0 +1,3 @@
+build
+~*
+*~

.travis.yml

@@ -3,7 +3,7 @@
 language: node_js
 
 node_js:
-  - lts/*
+  - 10/*
 
 sudo: required
 
@@ -22,7 +22,7 @@ cache:
     - /tmp/liftoff
 
 install:
-  - npm install @elementaryos/houston
+  - npm i -g @elementaryos/houston
 
 script:
   - houston ci

src/ColorPicker.vala

@@ -45,9 +45,11 @@ namespace ColorPicker {
             app_window.show_all ();
 
             var quit_action = new SimpleAction ("quit", null);
-
+            
             add_action (quit_action);
-            add_accelerator ("<Control>q", "app.quit", null);
+
+            //add_accelerator ("<Control>q", "app.quit", null);
+            set_accels_for_action ("app.quit", {"<Control>q"});
 
             quit_action.activate.connect (() => {
                 if (app_window != null) {

src/Widgets/Picker.vala

@@ -33,10 +33,8 @@ namespace ColorPicker.Widgets {
 
         const string bright_border_color_string = "#FFFFFF";
         private Gdk.RGBA bright_border_color = Gdk.RGBA();
-        
-        private int mouse_pos_x = 0;        
-        private int mouse_pos_y = 0;
-        
+
+
         // 1. Snapsize is the amount of pixel going to be magnified by the zoomlevel.
         // 2. The snapsize must be odd to have a 1px magnifier center.
         // 3. Asure that snapsize*max_zoomlevel+shadow_width*2 is smaller than 2 * get_screen ().get_display ().get_maximal_cursor_size()