Fix disappearing backslash bug

Backslashes weren't being escaped during compilation, causing templates
containing backslashes to mysteriously lose them.

lib/handlebars.js

@@ -28,10 +28,6 @@ var Handlebars = {
   escapeText: function(string) {
     string = string.replace(/'/g, "\\'");
     string = string.replace(/\"/g, "\\\"");
-    if (string.slice(-1) == "\\") {
-      string = string + "\\";
-    }
-
     return string;
   },
 
@@ -277,6 +273,8 @@ Handlebars.Compiler.prototype = {
           } else if (chr === "\r") {
             this.newlines = this.newlines + "\r";
             chr = "\\r";
+          } else if (chr === "\\") {
+            chr = "\\\\";
           }
           this.text = this.text + chr;
         }

test/handlebars.js

@@ -48,6 +48,7 @@ test("newlines", function() {
 test("escaping text", function() {
   shouldCompileTo("Awesome's", {}, "Awesome's", "text is escaped so that it doesn't get caught on single quotes");
   shouldCompileTo("Awesome\\", {}, "Awesome\\", "text is escaped so that the closing quote can't be ignored");
+  shouldCompileTo("Awesome\\ foo", {}, "Awesome\\ foo", "text is escaped so that it doesn't mess up backslashes");
   shouldCompileTo(' " " ', {}, ' " " ', "double quotes never produce invalid javascript");
 });