Support `use strict`: Change with(oj) to oj.extendInto(this)

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/with

Many scripts and libraries use `"use strict";`. In order to not run into complications, OJ probably should extend into the scope that it wants to. In the case of a rendering sequence:

``` javascript
(function(){try{ oj.extendInto(this); (function(){
h1("Foo bar");
}).apply(this);}catch(e){ handle_error(e); }})();
```

Just a thought, since I just read the article.