Issue209 - 1

I added the code for making a link to nagios server.
Please check the code.

I think I want to make a link to map of nagios server.
But I don't understand that it is good to implement it.
Because nagios web interface has frame web page.
So, when Hatohol makes a link to map page directory,
the page isn't shown menu of nagios.

Should I implement it?