Merge pull request #198 from DavidS/debian-8-support

Update metadata to note Debian 8 support

metadata.json

@@ -52,7 +52,8 @@
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
         "6",
-        "7"
+        "7",
+        "8"
       ]
     },
     {