add timeout to API; add api exception

src/OnePeek.Api/ApiHttpClient.cs

@@ -31,6 +31,7 @@ namespace OnePeek.Api
         AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip
       });
       httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2327.5 Safari/537.36 OPR/30.0.1812.0 (Edition developer)");
+      httpClient.Timeout = TimeSpan.FromSeconds(Configuration.TimeoutInSeconds);
     }
 
 

src/OnePeek.Api/Configuration.cs

@@ -10,5 +10,10 @@
     /// This changes it to a 1-5 scale, which is more suited for displaying it as stars.
     /// </summary>
     public static bool UseFiveStarSystem = false;
+
+    /// <summary>
+    /// Timeout for API requests in seconds.
+    /// </summary>
+    public static double TimeoutInSeconds = 60;
   }
 }

src/OnePeek.Api/OnePeekApiException.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace OnePeek.Api
+{
+  public class OnePeekApiException : Exception
+  {
+    public OnePeekApiException() : base() { }
+    public OnePeekApiException(string message) : base(message) { }
+    public OnePeekApiException(string message, Exception innerException) : base(message, innerException) { }
+  }
+}