Remove unused references

src/JiraTimeBot/Program.cs

@@ -1,7 +1,5 @@
 using JiraTimeBot.UI;
 using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
 using System.Threading;
 using System.Windows.Forms;
 using JiraTimeBot.UI.Tray;

src/JiraTimeBot/TaskTime/TaskTimeByCommitsCalculator.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading;
-using System.Web.UI.WebControls.WebParts;
 using JiraTimeBot.Configuration;
 using JiraTimeBot.Mercurial.Objects;
 using JiraTimeBot.TaskTime.Objects;