made ICompilerSettings and CSharpCodeProvider ctor public (#55)

* made ICompilerSettings interface public and the constructor on CSharpCodeProvider also public

* Made VBCodeProvider's internal ctor public, added comments to ICompilerSettings

Author: trullock

src/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/CSharpCodeProvider.cs

@@ -18,8 +18,12 @@ public CSharpCodeProvider()
             : this(null) {
         }
 
-        // Constructor used for unit test purpose
-        internal CSharpCodeProvider(ICompilerSettings compilerSettings = null) {
+        
+        /// <summary>
+        /// Creates an instance using the given ICompilerSettings
+        /// </summary>
+        /// <param name="compilerSettings"></param>
+        public CSharpCodeProvider(ICompilerSettings compilerSettings = null) {
             _compilerSettings = compilerSettings == null ? CompilationSettingsHelper.CSC2 : compilerSettings;
         }
 

src/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/Util/ICompilerSettings.cs

@@ -1,13 +1,21 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-
 namespace Microsoft.CodeDom.Providers.DotNetCompilerPlatform {
-    internal interface ICompilerSettings {
-        string CompilerFullPath { get; }
 
-        // TTL in seconds
-        int CompilerServerTimeToLive { get; }
+	/// <summary>
+	/// Provides settings for the C# and VB CodeProviders
+	/// </summary>
+	public interface ICompilerSettings {
+
+		/// <summary>
+		/// The full path to csc.exe or vbc.exe
+		/// </summary>
+		string CompilerFullPath { get; }
+
+		/// <summary>
+		/// TTL in seconds
+		/// </summary>
+		int CompilerServerTimeToLive { get; }
     }
 }

src/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/VBCodeProvider.cs

@@ -18,8 +18,11 @@ public VBCodeProvider()
             : this(null) {
         }
 
-        // Constructor used for unit test purpose
-        internal VBCodeProvider(ICompilerSettings compilerSettings = null) {
+		/// <summary>
+		/// Creates an instance using the given ICompilerSettings
+		/// </summary>
+		/// <param name="compilerSettings"></param>
+		public VBCodeProvider(ICompilerSettings compilerSettings = null) {
             _compilerSettings = compilerSettings == null ? CompilationSettingsHelper.VBC2 : compilerSettings;
         }