pic irq
fix a typo bug e e e

irq PIC_EOI
ignore action in bochsrc
readme
pic 8259.
adjust struct
page
paging
add kernel init file
enable paging

kernel放在前16M。由4个page table对应。
page directory在$(KMALLOC_START)起始处，之后是4个page table。
一个frame大小为4k
标记frame使用当前bitmap标记
fix int stack bug
e  monitor bug
add/modify some function
add cflag '-m32' to ycm_extra_conf
copy page directory prepare for fork

so ugly code >.<
e read disk
e
e
change stack location after init

to 0x1400000