deleted manifest.appcache and removed the attribute from the html tag.

appcache causes a major headache on firefox, need to really look into
that one day!

manifest.appcache

@@ -1,35 +0,0 @@
-CACHE MANIFEST
-# 7.0-next
-
-css/uhr.css
-css/uhr-black.css
-css/uhr-blue.css
-css/uhr-green.css
-css/uhr-pink.css
-css/uhr-red.css
-css/uhr-white.css
-css/uhr-yellow.css
-info/index.html
-info/info.css
-js/uhr.js
-js/uhr-de.js
-js/uhr-de_CH.js
-js/uhr-de_CH_genau.js
-js/uhr-dk.js
-js/uhr-en.js
-js/uhr-es.js
-js/uhr-fr.js
-js/uhr-it.js
-js/uhr-nl.js
-lib/jquery-2.1.0.min.js
-lib/jquery-cookie-1.4.0.js
-lib/jquery-ui-1.10.4.custom.min.js
-resources/apple-touch-icon-precomposed.png
-resources/close.png
-resources/favicon.png
-resources/settings.png
-resources/uhr.woff
-COPYING
-README.md
-VERSION
-index.html