- domManip was modifying the set of noded passed.

- domManip was modifying the set of noded passed.
- appendTo and prependTo was returning an incorrect gquery object.
- overloaded the methods appendTo and prependTo in order to accept the same options other methods do.
- allow document node to be used in append and prepend methods.
- Fixed an issue in ClipAnimation when the element has an absolute position set by css.