Update docs (#200)

This is a documentation-only update so automerging.  Please review the commit if there are any follow-ups requested.

* Update .gitignore for docfx genertated files

* Update documenation (part 1)

* Update docs and add some samples

* More doc updates

docs/samples/smo/netcore/ModifySetting/Program.cs

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+using Microsoft.Data.Tools.DataSets;
+using Microsoft.SqlServer.Management.Smo;
+using System;
+
+namespace Microsoft.SqlServer.Management.SmoSdkSamples
+{
+    // This example displays information about the instance of SQL Server in Information and Settings, and modifies settings in Settings and UserOptionsobject properties.
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+                //Connect to the local, default instance of SQL Server.
+                Microsoft.SqlServer.Management.Smo.Server srv = new Microsoft.SqlServer.Management.Smo.Server();
+                //Display all the configuration options.   
+                foreach (ConfigProperty p in srv.Configuration.Properties)
+                {
+                    Console.WriteLine(p.DisplayName);
+                }
+                Console.WriteLine("There are " + srv.Configuration.Properties.Count.ToString() + " configuration options.");
+                //Display the maximum and minimum values for ShowAdvancedOptions.                   
+                int min = srv.Configuration.ShowAdvancedOptions.Minimum;
+                int max = srv.Configuration.ShowAdvancedOptions.Maximum;
+                Console.WriteLine("Minimum and Maximum values are " + min + " and " + max + ".");
+                int configvalue = srv.Configuration.ShowAdvancedOptions.ConfigValue;
+                //Modify the value of ShowAdvancedOptions and run the Alter method.   
+                srv.Configuration.ShowAdvancedOptions.ConfigValue = 0;
+                srv.Configuration.Alter();
+                //Display when the change takes place according to the IsDynamic property.   
+                if (srv.Configuration.ShowAdvancedOptions.IsDynamic == true)
+                {
+                    Console.WriteLine("Configuration option has been updated.");
+                }
+                else
+                {
+                    Console.WriteLine("Configuration option will be updated when SQL Server is restarted.");
+                }
+                // Recover setting value
+                srv.Configuration.ShowAdvancedOptions.ConfigValue = configvalue;
+                srv.Configuration.Alter();
+        }
+    }
+}

docs/samples/smo/netcore/ModifySetting/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {
+    "Microsoft.SqlServer.Smo": "140.1.12"
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.0"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}