Options: Makes output linefeed adjustable.

* To make output readable in Notepad. 😄
* LibSass new API exposes this option via `sass_option_set_linefeed`.
* This is a **non-breaking change** using additional property
  `OutputLineFeed` as opposed to altering the public `Compile`
  signature.
* The default is set to `\r\n` as opposed to libsass default `\r`.
* In user space, it will be adjustable as follow:

  ```c#
  var sassCompiler = new SassCompiler();
  sassCompiler.OutputLineFeed = "\r";
  Console.WriteLine(sassCompiler.CompileFile(@"C:\temp\blah.scss").CSS);
  ```

Author: am11

libsass/SassInterface.cpp

@@ -33,6 +33,7 @@ namespace LibSassNet
     {
         char* includePaths = MarshalString(sassContext->Options->IncludePaths);
         char* sourceString = MarshalString(sassContext->SourceString);
+        char* lineFeed = MarshalString(sassContext->Options->LineFeed);
         struct Sass_Data_Context* ctx;
 
         try
@@ -45,6 +46,7 @@ namespace LibSassNet
             sass_option_set_output_style(options, GetOutputStyle(sassContext->Options->OutputStyle));
             sass_option_set_source_comments(options, sassContext->Options->IncludeSourceComments);
             sass_option_set_precision(options, sassContext->Options->Precision);
+            sass_option_set_linefeed(options, lineFeed);
             sass_option_set_include_path(options, includePaths);
             sass_option_set_omit_source_map_url(options, true);
 
@@ -88,8 +90,9 @@ namespace LibSassNet
         char* includePaths = MarshalString(sassFileContext->Options->IncludePaths);
         char* mapFile = MarshalString(sassFileContext->OutputSourceMapFile);
         char* inputPath = MarshalString(sassFileContext->InputPath);
-
+        char* lineFeed = MarshalString(sassFileContext->Options->LineFeed);
         struct Sass_File_Context* ctx;
+
         try
         {
             ctx = sass_make_file_context(inputPath);
@@ -101,6 +104,7 @@ namespace LibSassNet
             sass_option_set_output_style(options, GetOutputStyle(sassFileContext->Options->OutputStyle));
             sass_option_set_source_comments(options, sassFileContext->Options->IncludeSourceComments);
             sass_option_set_precision(options, sassFileContext->Options->Precision);
+            sass_option_set_linefeed(options, lineFeed);
             sass_option_set_include_path(options, includePaths);
             sass_option_set_omit_source_map_url(options, String::IsNullOrEmpty(sassFileContext->OutputSourceMapFile));
             sass_option_set_source_map_file(options, mapFile);

libsass/SassOptions.hpp

@@ -31,6 +31,7 @@ namespace LibSassNet
 			property bool IncludeSourceComments;
 			property int Precision;
 			property String^ IncludePaths;
+			property String^ LineFeed;
 	};
 
 	public ref class SassContext

libsassnet/SassCompiler.cs

@@ -29,6 +29,8 @@ public class SassCompiler : ISassCompiler
     {
         private readonly ISassInterface _sassInterface;
 
+        public string OutputLineFeed { get; set; }
+
         public SassCompiler()
         {
             _sassInterface = new SassInterface();
@@ -50,7 +52,8 @@ public string Compile(string source, OutputStyle outputStyle = OutputStyle.Neste
                     OutputStyle = (int)outputStyle,
                     IncludeSourceComments = includeSourceComments,
                     IncludePaths = includePaths != null ? String.Join(";", includePaths) : String.Empty,
-                    Precision = precision
+                    Precision = precision,
+                    LineFeed = OutputLineFeed ?? (OutputLineFeed = "\r\n")
                 }
             };
 
@@ -83,7 +86,8 @@ public CompileFileResult CompileFile(string inputPath, OutputStyle outputStyle =
                     OutputStyle = (int)outputStyle,
                     IncludeSourceComments = includeSourceComments,
                     IncludePaths = String.Join(";", includePaths),
-                    Precision = precision
+                    Precision = precision,
+                    LineFeed = OutputLineFeed ?? (OutputLineFeed = "\r\n")
                 },
                 OutputSourceMapFile = sourceMapPath
             };