Allow loading of .sjs files in node.js

Example program now works:

    var sjs = require('sweet.js'),
        example = require('./example');

Where ./example.sjs contains:

    module A {
	case ($a + $b) => {
	    $a
	}
    }

    exports.one = A(1 + 2);

lib/sweet.js

@@ -5123,6 +5123,12 @@ var fs = require("fs");
     exports.syntaxToTokens = syntaxToTokens;
     exports.tokensToSyntax = tokensToSyntax;
 
+    // Alow require('./example') for an example.sjs file.
+    require.extensions['.sjs'] = function(module, filename) {
+        var content = require('fs').readFileSync(filename, 'utf8');
+        module._compile(gen.generate(parse(content)), filename);
+    };
+
     // Deep copy.
     exports.Syntax = (function () {
         var name, types = {};

src/sweet.js

@@ -5123,6 +5123,12 @@ var fs = require("fs");
     exports.syntaxToTokens = syntaxToTokens;
     exports.tokensToSyntax = tokensToSyntax;
 
+    // Alow require('./example') for an example.sjs file.
+    require.extensions['.sjs'] = function(module, filename) {
+        var content = require('fs').readFileSync(filename, 'utf8');
+        module._compile(gen.generate(parse(content)), filename);
+    };
+
     // Deep copy.
     exports.Syntax = (function () {
         var name, types = {};