Deprecate .load(), .unload(), and .error() methods

[dmethvin]

These are shortcut names for $().bind("load", fn) etc.

• The .load() method is an ambiguous signature, it can either be an ajax load or attach/fire a "load" event. CCAO cannot tell them apart since it's a dynamic decision based on arguments.
• If .load() is being deprecated, .unload() should be as well.
• The .error() method has never worked to attach a window.onerror event since the function signature is not the same as a standard event handler. It may also be confused with jQuery.error() which is not related.

[dmethvin]

Docs updated.