Merge pull request #3 from dschen/carolyn

changes sim() to simulate() because sim() is a matlab builtin
updating gitignore
Merge branch 'master' of github.com:dschen/429
it's working :D
Merge pull request #4 from dschen/dorothy

it's working :D
simulate now returns double instead of uint8
Merge branch 'master' of https://github.com/dschen/429 into carolyn