normalize favicons, tiles and touchicons

packages/rocketchat-assets/server/assets.coffee

packages/rocketchat-favico/favico.js

packages/rocketchat-ui-master/master/main.html

public/images/logo/android-chrome-144x144.png

public/images/logo/android-chrome-36x36.png

public/images/logo/android-chrome-48x48.png

public/images/logo/android-chrome-512x512.png

public/images/logo/android-chrome-72x72.png

public/images/logo/android-chrome-96x96.png

public/images/logo/android-hdpi.png

public/images/logo/android-mdpi.png

public/images/logo/android-xhdpi.png

public/images/logo/android-xxhdpi.png

public/images/logo/android-xxxhdpi.png

public/images/logo/apple-touch-icon-1024x1024.png

public/images/logo/apple-touch-icon-114x114.png

public/images/logo/apple-touch-icon-120x120.png

public/images/logo/apple-touch-icon-144x144.png

public/images/logo/apple-touch-icon-152x152.png

public/images/logo/apple-touch-icon-172x172.png