fixed minor typo
edited calcgrade.sh so unverified signatures don't show as "bad signature" and instead say "signed but untrusted". Students aren't likely to have a web of trust that includes the instructors.
added a function that will check if a key already exists in repository
Adds signing key to repository if it does not already exist
addgrader.sh will now append new keys instead of overwriting
Update README.md
Merge pull request #318 from Liniarc/new

Students can now see signed commits. Fixed typo in config.sh
Update README.md
added check for Instructor Keys
added check for gpg
cleaned up colors and added warning function
Merge pull request #347 from hgarc014/cs100-2014fall

calcgrade now checks for gpg and Keys
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