vimrc :: enable undofile + set undodir

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
vimrc :: set relativenumber, handy to see how far of the current line another line is

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
vimrc :: nicely align on-the-same line comments

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
vimrc :: go and force encoding to utf8

Signed-off-by: BlackEagle <ike.devolder@gmail.com>