bcm_sta: update to 6.30.223.248

update driver and revise patches needed for 3.17 kernel

bcm_sta: fix typo
Merge pull request #3566 from chewitt/bcmsta-update

bcm_sta: update to 6.30.223.248
update CONTRIBUTING.md
Merge pull request #3671 from stefansaraev/contributing

update CONTRIBUTING.md
libmad: build static

TODO: not used in core. move to unofficial?
Mesa: update to Mesa-10.3.5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
kodi: update to kodi-14-8d4cdb5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
misc-firmware: update to misc-firmware-0.0.13

Signed-off-by: Stephan Raue <stephan@openelec.tv>
wlan-firmware: update to wlan-firmware-0.0.26

Signed-off-by: Stephan Raue <stephan@openelec.tv>
dvb-firmware: update to dvb-firmware-0.0.47

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.17.5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
[xpad] remove outdated valve rework patch
[xpad] remove bogus patch
[xpad] update to 3.18
[xpad] add valve rework patch