Disable send anonymous usage statistics by default and added option in Preferences

app/Application.js

@@ -26,6 +26,21 @@ Ext.define('Rambox.Application', {
 	}
 
 	,launch: function () {
+		// Prevent track if the user have disabled this option (default: false)
+		if ( !ipc.sendSync('sendStatistics') ) {
+			ga_storage = {
+				 _enableSSL: Ext.emptyFn
+				,_disableSSL: Ext.emptyFn
+				,_setAccount: Ext.emptyFn
+				,_setDomain: Ext.emptyFn
+				,_setLocale: Ext.emptyFn
+				,_setCustomVar: Ext.emptyFn
+				,_deleteCustomVar: Ext.emptyFn
+				,_trackPageview: Ext.emptyFn
+				,_trackEvent: Ext.emptyFn
+			}
+		}
+
 		// Set Google Analytics events
 		ga_storage._setAccount('UA-80680424-1');
 		ga_storage._trackPageview('/index.html', 'main');

app/view/preferences/Preferences.js

@@ -337,6 +337,12 @@ Ext.define('Rambox.view.preferences.Preferences',{
 							}
 						]
 					}
+					,{
+						 xtype: 'checkbox'
+						,name: 'sendStatistics'
+						,boxLabel: locale['preferences[27]']
+						,value: config.sendStatistics
+					}
 				]
 			}
 		];

electron/main.js

@@ -38,6 +38,7 @@ const config = new Config({
 		,locale: 'en'
 		,enable_hidpi_support: false
 		,default_service: 'ramboxTab'
+		,sendStatistics: false
 
 		,x: undefined
 		,y: undefined
@@ -336,6 +337,10 @@ ipcMain.on('setConfig', function(event, values) {
 	}
 });
 
+ipcMain.on('sendStatistics', function(event) {
+	event.returnValue = config.get('sendStatistics');
+});
+
 ipcMain.on('validateMasterPassword', function(event, pass) {
 	if ( config.get('master_password') === require('crypto').createHash('md5').update(pass).digest('hex') ) {
 		createWindow();