Resolve ASP.NET environments without HTTP contexts

src/React.Web/AspNetCache.cs

@@ -28,10 +28,9 @@ public class AspNetCache : ICache
 		/// <summary>
 		/// Initializes a new instance of the <see cref="AspNetCache"/> class.
 		/// </summary>
-		/// <param name="context">The HTTP context</param>
-		public AspNetCache(HttpContextBase context)
+		public AspNetCache()
 		{
-			_cache = context.Cache;
+			_cache = HttpRuntime.Cache;
 		}
 
 		/// <summary>

src/React.Web/AspNetFileSystem.cs

@@ -7,7 +7,7 @@
  *  of patent rights can be found in the PATENTS file in the same directory.
  */
 
-using System.Web;
+using System.Web.Hosting;
 
 namespace React.Web
 {
@@ -17,28 +17,14 @@ namespace React.Web
 	/// </summary>
 	public class AspNetFileSystem : FileSystemBase
 	{
-		/// <summary>
-		/// The ASP.NET server utilities
-		/// </summary>
-		private readonly HttpServerUtilityBase _serverUtility;
-
-		/// <summary>
-		/// Initializes a new instance of the <see cref="AspNetFileSystem"/> class.
-		/// </summary>
-		/// <param name="serverUtility">The server utility.</param>
-		public AspNetFileSystem(HttpServerUtilityBase serverUtility)
-		{
-			_serverUtility = serverUtility;
-		}
-
 		/// <summary>
 		/// Converts a path from an application relative path (~/...) to a full filesystem path
 		/// </summary>
 		/// <param name="relativePath">App-relative path of the file</param>
 		/// <returns>Full path of the file</returns>
 		public override string MapPath(string relativePath)
 		{
-			return _serverUtility.MapPath(relativePath);
+			return HostingEnvironment.MapPath(relativePath);
 		}
 	}
 }