Is week1 a submodule?
Note the relevant part from the output of the git status command:
(commit or discard the untracked or modified content in submodules)
Try cd week1 and issuing another git status to see what changes you have made to the week1 submodule.
See http://git-scm.com/book/en/Git-Tools-Submodules for more information about how submodules work in Git.
