Added Header, Icon and MessageModal. Refactor screens into directories.

mobile/src/Auth/Logout.js

@@ -0,0 +1,21 @@
+import React, { Component } from 'react'
+import PropTypes from 'prop-types'
+import { api } from '../API'
+
+export class Logout extends Component {
+  static propTypes = {
+    history: PropTypes.oneOfType([PropTypes.array, PropTypes.object]),
+  }
+
+  componentDidMount(event) {
+    const cb = () => {
+      this.props.history.replace('/login')
+    }
+
+    api.logout().then(cb, cb)
+  }
+
+  render() {
+    return null
+  }
+}