improve makefile and add install and uninstall

Signed-off-by: Mattias Andrée <maandree@operamail.com>
forgot to use prefix and include .h

Signed-off-by: Mattias Andrée <maandree@operamail.com>
oh, yeah, I did it that way

Signed-off-by: Mattias Andrée <maandree@operamail.com>
typo

Signed-off-by: Mattias Andrée <maandree@operamail.com>
prefix so files with lib

Signed-off-by: Mattias Andrée <maandree@operamail.com>