ALARM IMPLEMENTATION

CAN BE COMPILED BUT NOT RUNNING
CHANGED TEST FILES
Working copy

simulateneous, priority tests are not working.
deleted files which should not be tracked
Merge branch 'master' of git://github.com/ssps/ee311-pintos into eru

Conflicts:
	src/devices/timer.c
merged with origin master
This is the first commit

Working
1.argument passing for less than 5 arugments
2.echo program (includes simple exit and write system calls)

TODO
1. synchronize child and parent, file descriptors
2. impelement more system calls to run the tests