Added ACPI Shutdown sequence since QEMU on higher version(1.7) didn't accept tradition 'Shutdown' string on 0x8900 port
Make.config changed to support i386-linux-gcc cross compiler on Darwin kernel
Default simulator to QEMU and modified pintos perl script to find correct qemu binary(qemu-system-i386)
Make.config changed to use i386-elf-gcc instead of i386-linux-gcc (uses homebrew to install cross compiler)
Stage 1: Alarm implementation complete
gitignore gtags files
Stage 1: basic priority pass