Added yaourt backend for the updates script.

i3pystatus/updates/yaourt.py

@@ -0,0 +1,17 @@
+"""
+This module counts the available updates using yaourt.
+You should not use it together with the pacman backend otherwise
+some packeges might be counted twice.
+"""
+
+from i3pystatus.core.command import run_through_shell
+from i3pystatus.updates import Backend
+
+class Yaourt(Backend):
+
+    @property
+    def updates(self):
+        command = ["yaourt", "-Qua"]
+        checkupdates = run_through_shell(command)
+        return checkupdates.out.count('\n')
+Backend = Yaourt