Rename logo and add 32x32 version

src/js/components/Bubble.js

@@ -1,6 +1,6 @@
 import React from "react"
 import PropTypes from "prop-types"
-import logoUrl from "images/logo.png"
+import logoUrl from "images/moco-159x159.png"
 
 const Bubble = ({ bookedHours }) => (
   <div className="moco-bx-bubble-inner">

src/js/components/Errors/UnknownError.js

@@ -1,6 +1,6 @@
 import React from "react"
 import PropTypes from "prop-types"
-import logo from "images/logo.png"
+import logo from "images/moco-159x159.png"
 
 const UnknownError = ({ message = "Unbekannter Fehler" }) => (
   <div className="moco-bx-error-container">

src/js/components/Errors/UpgradeRequiredError.js

@@ -1,6 +1,6 @@
 import React from "react"
 import { isChrome } from "utils/browser"
-import logo from "images/logo.png"
+import logo from "images/moco-159x159.png"
 import firefoxAddons from "images/firefox_addons.png"
 
 const UpgradeRequiredError = () => (

src/js/components/shared/Header.js

@@ -1,6 +1,6 @@
 import React from "react"
 import PropTypes from "prop-types"
-import logoUrl from "images/logo.png"
+import logoUrl from "images/moco-159x159.png"
 
 const Header = ({ subdomain }) => (
   <div className="moco-bx-logo__container">