Escape unicode newlines in string literals

Fixes #375

Author: kpdecker

dist/handlebars.js

@@ -1971,7 +1971,9 @@ JavaScriptCompiler.prototype = {
       .replace(/\\/g, '\\\\')
       .replace(/"/g, '\\"')
       .replace(/\n/g, '\\n')
-      .replace(/\r/g, '\\r') + '"';
+      .replace(/\r/g, '\\r')
+      .replace(/\u2028/g, '\\u2028')   // Per Ecma-262 7.3 + 7.8.4
+      .replace(/\u2029/g, '\\u2029') + '"';
   },
 
   setupHelper: function(paramSize, name, missingParams) {

lib/handlebars/compiler/compiler.js

@@ -1130,7 +1130,9 @@ JavaScriptCompiler.prototype = {
       .replace(/\\/g, '\\\\')
       .replace(/"/g, '\\"')
       .replace(/\n/g, '\\n')
-      .replace(/\r/g, '\\r') + '"';
+      .replace(/\r/g, '\\r')
+      .replace(/\u2028/g, '\\u2028')   // Per Ecma-262 7.3 + 7.8.4
+      .replace(/\u2029/g, '\\u2029') + '"';
   },
 
   setupHelper: function(paramSize, name, missingParams) {

spec/qunit_spec.js

@@ -1408,6 +1408,10 @@ test('GH-458: Scoped this identifier', function() {
   shouldCompileTo('{{./foo}}', {foo: 'bar'}, 'bar');
 });
 
+test('GH-375: Unicode line terminators', function() {
+  shouldCompileTo('\u2028', {}, '\u2028');
+});
+
 suite('Utils');
 
 test('escapeExpression', function() {