Enable Quick Info hover tooltips (#65)

Pushing to include in tomorrow's partner release build.  Please send me any feedback and I'll address in the next Intellisense PR.

src/Microsoft.SqlTools.ServiceLayer/SqlContext/IntelliSenseSettings.cs

@@ -18,6 +18,7 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
             this.EnableSuggestions = true;
             this.LowerCaseSuggestions = false;
             this.EnableDiagnostics = true;
+            this.EnableQuickInfo = true;
         }
 
         /// <summary>
@@ -36,6 +37,11 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
         /// </summary>
         public bool? EnableDiagnostics { get; set; }
 
+        /// <summary>
+        /// Gets or sets a flag determining if quick info is enabled
+        /// </summary>
+        public bool? EnableQuickInfo { get; set; }
+
         /// <summary>
         /// Update the Intellisense settings
         /// </summary>
@@ -47,6 +53,7 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
                 this.EnableSuggestions = settings.EnableSuggestions;
                 this.LowerCaseSuggestions = settings.LowerCaseSuggestions;
                 this.EnableDiagnostics = settings.EnableDiagnostics;
+                this.EnableQuickInfo = settings.EnableQuickInfo;
             }
         }
     }