bluez: clean up dbus

we dont want dbus-daemon to try-start bluez/obexd. we have
own service units. so this is pointless and just fails
with an error in journal
systemd: rename patches
systemd: dont rename network interfaces

again. udev rule name has changed in systemd 209
setxkbmap: simplify layout setup

IMPORT{file} is enough
systemd: more hwdb cleanup after systemd-209
config/path: source config/functions early

$(kernel_path) should be available to PKG_CONFIGURE_OPTS_* now
iptables: use kernel_path
syslinux: update to syslinux-6.02. dont install isolinux
connman: fix double post_install
xorg: xorg.service: it's ok to fail if xorg is not yet configured
xorg-launch-helper: add xorg-launch
xorg: xorg.service: use xorg-launch
xorg: xorg-configure: cleanup
update TODO
Virtual: update vbox to 4.3.8_RC1
config/optimize: remove fast/speed
projects/*/options: make it clear that only size/normal is supported
linux: update to linux-3.13.5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge pull request #2951 from stefansaraev/optimizations

optimizations