Document global Mustache.escape overriding capacity (#644)

README.md

@@ -178,7 +178,9 @@ function loadUser() {
 
 The most basic tag type is a simple variable. A `{{name}}` tag renders the value of the `name` key in the current context. If there is no such key, nothing is rendered.
 
-All variables are HTML-escaped by default. If you want to render unescaped HTML, use the triple mustache: `{{{name}}}`. You can also use `&` to unescape a variable.
+All variables are HTML-escaped by default. If you want to render unescaped HTML, use the triple mustache: `{{{name}}}`. You can also use `&` to unescape a variable. 
+
+If you'd like to change HTML-escaping behavior globally (for example, to template non-HTML formats), you can override Mustache's escape function. For example, to disable all escaping: `Mustache.escape = function(text) {return text;};`.
 
 If you want `{{name}}` _not_ to be interpreted as a mustache tag, but rather to appear exactly as `{{name}}` in the output, you must change and then restore the default delimiter. See the [Custom Delimiters](#custom-delimiters) section for more information.