New feature: You can now inject portions of a document via .load(), as opposed to...

New feature: You can now inject portions of a document via .load(), as opposed to the full thing.

Examples:
- $("#test").load("test.html #something");
- $("#test").load("test.html p.user");

Caveats:
- No scripts are injected when a selector is used.
- The selector is rooted inside the head and body - it's equivalent to doing:
  $("body,head").find(selector)