addgrader.sh will now append keys. It will no longer make a new key if a key already exists
removed key checking from "uploadGrades" function.
Bug fix
Update README.md
Fixed typos in Timer.h
Merge pull request #397 from DustinPham/cs100-2014fall

Update hw2 README.md, fixed syscall tutorial link and changed reference to hw0 instead of hw1
Merge pull request #398 from jstod001/cs100-2014fall

Fixed typos in Timer.h
Merge pull request #355 from Liniarc/new2

addgrader.sh will now run more universally
Update README.md
Merge pull request #402 from DustinPham/cs100-2014fall

Update README.md, fixed incomplete sentence