Added mojang account validation UI.

Other minor fixes included. Bumped version from dev to alpha. Testing to begin soon.

app/assets/js/scripts/welcome.js

@@ -2,7 +2,5 @@
  * Script for welcome.ejs
  */
 document.getElementById('welcomeButton').addEventListener('click', e => {
-    $('#welcomeContainer').fadeOut(500, () => {
-        $('#loginContainer').fadeIn(500)
-    })
+    switchView(VIEWS.welcome, VIEWS.login)
 })