Add body.style.align to documentation + more options

[drwasho]

Jasonette has an undocumented feature called body.style.align. When it is set to bottom, the view will scroll to the bottom after every $render or $reload (which is great for chat).

An unsupported feature would be to add top, which makes the view scroll to the top after every $render/$reload.

Whatever the current behaviour is should be default or something, not sure.