Vim: move .vimrc into .vim directory

As of Vim 7.3.1178, Vim will fallback to ~/.vim/vimrc if ~/.vimrc
doesn't exist.

As I'm running 7.4 on all the machines I control (ie. one machine...),
I'm going to move the .vimrc into the subdirectory to reduce clutter.

Discovered via:

  http://www.reddit.com/r/vim/comments/1v3z8p/can_i_put_my_vimrc_in_my_vim_folder/

Signed-off-by: Wincent Colaiuta <win@wincent.com>