Installer enhancement: Firewall Exception

Added an option to select / deselect the Windows Firewall Exception.
Merge pull request #88 from StevenKleist/develop

Installer enhancement: Firewall Exception. Fixes #58.
Added peer ID (HA) and user agent. Fixes #87.
Added calculated field for download/upload rate limits. Fixes #90.
Save resume data every five minutes. Fixes #85.
Merge pull request #12 from hadouken/develop

update request