gdb: fix thread debugging
Merge pull request #2543 from susisstrolch/gbd-thread_debugging

gdb: fix thread debugging
some minor typo and grammar fixes
Merge pull request #2545 from ysim/contributing-readme-changes

some minor typo and grammar fixes
projects/*/linux: remove option to disable GPU powermanagement on remaining projects

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
xkb-setup: clean up
Merge remote-tracking branch 'upstream/master' into openelec-systemd
clean up