Fixing project names to fix VS bugs

For whatever reason, Visual Studio throws a fit if a referenced project has a name
and the folder name (which is used to reference the project) is different than that name.
To solve this issue, I've renamed all the projects and folders to match their project
names as stated in the project.json.

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/Contracts/Diagnostics.cs

@@ -0,0 +1,72 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+using Microsoft.SqlTools.ServiceLayer.WorkspaceServices.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.LanguageServices.Contracts
+{
+    public class PublishDiagnosticsNotification
+    {
+        public static readonly
+            EventType<PublishDiagnosticsNotification> Type = 
+            EventType<PublishDiagnosticsNotification>.Create("textDocument/publishDiagnostics");
+
+        /// <summary>
+        /// Gets or sets the URI for which diagnostic information is reported.
+        /// </summary>
+        public string Uri { get; set; }
+
+        /// <summary>
+        /// Gets or sets the array of diagnostic information items.
+        /// </summary>
+        public Diagnostic[] Diagnostics { get; set; }
+    }
+
+    public enum DiagnosticSeverity 
+    {
+        /// <summary>
+        /// Indicates that the diagnostic represents an error.
+        /// </summary>
+        Error = 1,
+
+        /// <summary>
+        /// Indicates that the diagnostic represents a warning.
+        /// </summary>
+        Warning = 2,
+
+        /// <summary>
+        /// Indicates that the diagnostic represents an informational message.
+        /// </summary>
+        Information = 3,
+
+        /// <summary>
+        /// Indicates that the diagnostic represents a hint.
+        /// </summary>
+        Hint = 4
+    }
+
+    public class Diagnostic
+    {
+        public Range Range { get; set; }
+
+        /// <summary>
+        /// Gets or sets the severity of the diagnostic.  If omitted, the
+        /// client should interpret the severity.
+        /// </summary>
+        public DiagnosticSeverity? Severity { get; set; }
+
+        /// <summary>
+        /// Gets or sets the diagnostic's code (optional).
+        /// </summary>
+        public string Code { get; set; }
+
+        /// <summary>
+        /// Gets or sets the diagnostic message.
+        /// </summary>
+        public string Message { get; set; }
+    }
+}
+