Change incorrect powershell script name in vip-init.bat and improve UAC prompt declined handling

#102 Had the powershell script incorrectly listed as "2vip-init.ps1" instead of the proper "vip-init.ps1". This is fixed in 11d6494.

e6906a3 Improves how the /wbin/vip-quickstart.ps1 script handles a declined UAC prompt. Previously if the user declines the UAC prompt for editing the hosts file a powershell error would've been shown to the user (although the rest of the script would function properly). Now, the powershell error is handled gracefully and the user is shown a message telling them that they will need to manually edit the hosts file or re-run the script.