Update system form webUI

This will download form branch "update", it checking for updates from a webserver. (I can send you the file so you can have them on minepeon's server) So when we push a update to branch "update" and edit the update.xml file, you will get a message on minepeon's webUI. 

![image](https://f.cloud.github.com/assets/1642635/2368662/40ea7eea-a7b6-11e3-9edf-cd60b4449745.png)

also i added so if the mh/s is bigger then 1000 it will convert it to gh/s