line up the comments
auto merge of #754 : blaenk/cargo/whitespace, r=alexcrichton

I missed this when I changed the values to the defaults! It simply lines up the comment with the one above it.
cargo new: Don't create a git repo in subdirectory

Running `cargo new` to create a subpackage shouldn't create another
git repository if one exists in a parent directory.

Closes #664