rebind keys to *-visual-line if visual-line-mode is enabled

[William Xu]

Hi,

When visual-line-mode is enabled, those emacs movement/deletions/.. keys will
operate on visual line automatically.  e.g, C-a to the beginning of visual line;
C-k will kill current visual line.

In evil-mode, why do we need additional keys to do that?  Like g0, and dd will
still kill the logical line, not visual line.  Can we have the same behavior as
emacs keys?