Issue 408 fix for boolean preferences

This commit fixes issue when boolean preferences set to 'false' value
with 'true' being logically default were not saved.

Author: infthi

it.baeyens.arduino.common/src/it/baeyens/arduino/common/Defaults.java

@@ -0,0 +1,6 @@
+package it.baeyens.arduino.common;
+
+public class Defaults {
+	public static final boolean OPEN_SERIAL_WITH_MONITOR = true;
+	public static final boolean AUTO_IMPORT_LIBRARIES = true;
+}

it.baeyens.arduino.common/src/it/baeyens/arduino/common/InstancePreferences.java

@@ -26,7 +26,7 @@
 public class InstancePreferences extends Const {
 
     public static boolean getOpenSerialWithMonitor() {
-	return getGlobalBoolean(KEY_OPEN_SERIAL_WITH_MONITOR, true);
+	return getGlobalBoolean(KEY_OPEN_SERIAL_WITH_MONITOR, Defaults.OPEN_SERIAL_WITH_MONITOR);
     }
 
     public static void setOpenSerialWithMonitor(boolean value) {
@@ -39,7 +39,7 @@ public static void setOpenSerialWithMonitor(boolean value) {
      * @return true if libraries need to be added else false.
      */
     public static boolean getAutomaticallyIncludeLibraries() {
-	return getGlobalBoolean(KEY_AUTO_IMPORT_LIBRARIES, true);
+	return getGlobalBoolean(KEY_AUTO_IMPORT_LIBRARIES, Defaults.AUTO_IMPORT_LIBRARIES);
     }
 
     public static void setAutomaticallyIncludeLibraries(boolean value) {

it.baeyens.arduino.core/src/it/baeyens/arduino/ui/PreferencePage.java

@@ -15,6 +15,7 @@
 import org.eclipse.ui.preferences.ScopedPreferenceStore;
 
 import it.baeyens.arduino.common.Const;
+import it.baeyens.arduino.common.Defaults;
 
 /**
  * ArduinoPreferencePage is the class that is behind the preference page of
@@ -38,7 +39,11 @@ public class PreferencePage extends FieldEditorPreferencePage implements IWorkbe
     public PreferencePage() {
 	super(org.eclipse.jface.preference.FieldEditorPreferencePage.GRID);
 	setDescription(Messages.ui_workspace_settings);
-	setPreferenceStore(new ScopedPreferenceStore(InstanceScope.INSTANCE, Const.NODE_ARDUINO));
+	
+	ScopedPreferenceStore preferences = new ScopedPreferenceStore(InstanceScope.INSTANCE, Const.NODE_ARDUINO);
+	preferences.setDefault(Const.KEY_OPEN_SERIAL_WITH_MONITOR, Defaults.OPEN_SERIAL_WITH_MONITOR);
+	preferences.setDefault(Const.KEY_AUTO_IMPORT_LIBRARIES, Defaults.AUTO_IMPORT_LIBRARIES);
+	setPreferenceStore(preferences);
     }
 
     @Override