Merge pull request #13 from berenddeboer/master

Use ssh-add to check if agent is started as ps does not always work

functions/__ssh_agent_is_started.fish

@@ -7,6 +7,8 @@ function __ssh_agent_is_started -d "check if ssh agent is already started"
 		return 1
 	end
 
-	ps -ef | grep $SSH_AGENT_PID | grep -v grep | grep -q ssh-agent
-	return $status
+	ssh-add -l > /dev/null 2>&1
+	if test $status -eq 2
+		return 1
+	end
 end