Slight improvement of the ARP entries and some re-factoring of the Installer

Hello,

I just have re-factored the ARP related entries so that it looks "nice" in the "Uninstall or change a program" section of the control panel:
![arp_entries](https://cloud.githubusercontent.com/assets/442931/3434031/965feb3a-0085-11e4-8106-5623d70a9385.png)
Furthermore I have moved the ARP entries from HKLM to HKCU. After all the installer is running with user execution level ("RequestExecutionLevel user"), so I would suggest not to use HKLM  registry keys.