Moved discovery of loggers and weather providers to MEF. Also added support for third-party image processors, also discovered through MEF.

MediaBrowser.Controller/Weather/BaseWeatherProvider.cs

@@ -0,0 +1,34 @@
+using MediaBrowser.Common.Logging;
+using MediaBrowser.Model.Weather;
+using System;
+using System.Net;
+using System.Net.Cache;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Weather
+{
+    public abstract class BaseWeatherProvider : IDisposable
+    {
+        protected HttpClient HttpClient { get; private set; }
+
+        protected BaseWeatherProvider()
+        {
+            var handler = new WebRequestHandler { };
+
+            handler.AutomaticDecompression = DecompressionMethods.Deflate;
+            handler.CachePolicy = new RequestCachePolicy(RequestCacheLevel.Revalidate);
+
+            HttpClient = new HttpClient(handler);
+        }
+
+        public virtual void Dispose()
+        {
+            Logger.LogInfo("Disposing " + GetType().Name);
+
+            HttpClient.Dispose();
+        }
+
+        public abstract Task<WeatherInfo> GetWeatherInfoAsync(string zipCode);
+    }
+}