Merge pull request #7 from gbrlrz017/master

Master
initialized files
getenv/execv part done. And displaying current working directory too
cd works fine
everything working fine. A few bugs.
removed unecessary files.
removed .swp .swo files
final product -- hw3
merging

nch 'hw3'

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.