Force toString in escapeExpression

Fixes #211

dist/handlebars.js

@@ -825,6 +825,11 @@ Handlebars.Utils = {
       return "";
     }
 
+    // Force a string conversion as this will be done by the append regardless and
+    // the regex test will do this transparently behind the scenes, causing issues if
+    // an object's to string has escaped characters in it.
+    string = string.toString();
+
     if(!possible.test(string)) { return string; }
     return string.replace(badChars, escapeChar);
   },

dist/handlebars.runtime.js

@@ -211,6 +211,11 @@ Handlebars.Utils = {
       return "";
     }
 
+    // Force a string conversion as this will be done by the append regardless and
+    // the regex test will do this transparently behind the scenes, causing issues if
+    // an object's to string has escaped characters in it.
+    string = string.toString();
+
     if(!possible.test(string)) { return string; }
     return string.replace(badChars, escapeChar);
   },

lib/handlebars/utils.js

@@ -47,6 +47,11 @@ Handlebars.Utils = {
       return "";
     }
 
+    // Force a string conversion as this will be done by the append regardless and
+    // the regex test will do this transparently behind the scenes, causing issues if
+    // an object's to string has escaped characters in it.
+    string = string.toString();
+
     if(!possible.test(string)) { return string; }
     return string.replace(badChars, escapeChar);
   },