add support for fee customization

Signed-off-by: Matias Alejo Garcia <ematiu@gmail.com>

src/js/controllers/preferencesFee.js

@@ -0,0 +1,35 @@
+'use strict';
+
+angular.module('copayApp.controllers').controller('preferencesFeeController',
+  function($rootScope, $scope, configService, go) {
+    var config = configService.getSync();
+    this.feeName = config.wallet.settings.feeName || 'Priority';
+    this.feeOpts = [{
+      name: 'Priority',
+      value: 100,
+    }, {
+      name: 'Normal',
+      value: 50,
+    }, {
+      name: 'Economy',
+      value: 10,
+    }];
+
+    this.save = function(newFee) {
+      var opts = {
+        wallet: {
+          settings: {
+            feeName: newFee.name,
+            feeValue: newFee.value * 100,
+          }
+        }
+      };
+      this.feeName = newFee.name;
+
+      configService.set(opts, function(err) {
+        if (err) console.log(err);
+        $scope.$emit('Local/UnitSettingUpdated');
+      });
+
+    };
+  });