switched to linaro-4.9.1 toolchain
added busybox for potential init.d scripts
ARM: support XZ compressed kernels

Wire up support for the XZ decompressor

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

Conflicts:
	arch/arm/boot/compressed/Makefile
added XZ kernel compression
gitignore: update to ignore new xz generated files
reverted back to gcc-4.9 toolchain
	modified:   arch/arm/boot/compressed/Makefile XZ kernel compression added
	modified:   arch/arm/configs/slim_t0lte_defconfig defconfig: added XZ compression; reverted back to GZIP
initial
	deleted:    arch/arm/configs/slim_t0lte_defconfig.bak deprecated, don't need backup
	deleted:    scripts/conmakehash initial commit
	deleted:    scripts/kallsyms initial commit