Adding portable class library version.

Changed some code to support PCL limitations.
Added PCL compilation and build to appveyor.

Author: babelshift

SteamWebAPI2.Portable/Properties/AssemblyInfo.cs

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+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SteamWebAPI2")]
+[assembly: AssemblyDescription("This is a .NET library that makes it easy to use the Steam Web API. It conveniently wraps around all of the JSON data and ugly API details with clean methods, structures and classes.")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Justin Skiles")]
+[assembly: AssemblyProduct("SteamWebAPI2")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.1.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

SteamWebAPI2.Portable/SteamWebAPI2.Portable.csproj

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+{
+  "supports": {
+    "net46.app": {},
+    "uwp.10.0.app": {}
+  },
+  "dependencies": {
+    "Microsoft.NETCore": "5.0.0",
+    "Microsoft.NETCore.Portable.Compatibility": "1.0.0",
+    "Newtonsoft.Json": "8.0.2"
+  },
+  "frameworks": {
+    "dotnet": {
+      "imports": "portable-net452+win81"
+    }
+  }
+}