message: loading on login
diff: import React from 'react';
  -// import Spinner from 'react-native-loading-spinner-overlay';
  +import Spinner from 'react-native-loading-spinner-overlay';
  import PropTypes from 'prop-types';
  import { Keyboard, Text, TextInput, View, TouchableOpacity, SafeAreaView } from 'react-native';
  @@ -143,6 +143,7 @@ class LoginView extends React.Component {
  </TouchableOpacity>
  {this.props.login.failure && <Text style={styles.error}>{this.props.login.error.reason}</Text>}
  </View>
  + <Spinner visible={this.props.login.isFetching} textContent='Loading...' textStyle={{ color: '#FFF' }} />
  </SafeAreaView>
  </View>
  </KeyboardView>
  