Update README.md

Corrected spelling of word and eliminated unecessarily repeated word.
Merge pull request #248 from jesuscreyes/cs100-2014fall

Update README.md
Update README.md

Changed "it" to "is" to make better sense of the sentence
Merge pull request #250 from DustinPham/cs100-2014fall

Update README.md
Fixed spelling of "connector" to reflect the two previous uses of "connecter" in the sentence, "The connector is an optional way you can run multiple commands..."
Merge pull request #251 from jstod001/cs100-2014fall

Fixed README.md
add myself to the Directory of Students
Merge pull request #255 from luizlopezm/cs100-2014fall

enrolling in cs100
updated README.md: changed wording of question, "you can...?" to "can you...?"
Merge pull request #275 from jstod001/cs100-2014fall

updated README.md
Fixed typo
Merge pull request #289 from lpeng003/cs100-2014fall

Fixed typo
lecture notes
Merge branch 'cs100-2014fall' of https://github.com/mikeizbicki/ucr-cs100 into cs100-2014fall
Update README.md
lecture notes
Merge branch 'cs100-2014fall' of https://github.com/mikeizbicki/ucr-cs100 into cs100-2014fall
renamed coreutils file
Update GRADES.md

Under the instructions to use the `scripts/calcgrade.sh` script to check our overall grade, I changed: "The `calcgrade.sh` script expects a single argument that corresponds to the github account of the grade you want to check." to "The `calcgrade.sh` script expects a single argument that corresponds to the github account of the grade you want to check." 

I thought this would be clearer since appending my github account didn't work for me but my ucr netid/cs account did, and based on what the instructors said in issue #303.
Update ls.cpp

The missing semi-colon generated two compiler time errors.