Fix upcoming Git 2.0 breaking change to `git add -A`.

Using SCM Breeze right now, the ctrl-X+space shortcut (which calls the git_commit_all shell status shortcut) triggers this message:

```
tmp$  git_commit_all
Committing all files (15)
Commit Message: Periodic commit.
warning: The behavior of 'git add --all (or -A)' with no path argument from a
subdirectory of the tree will change in Git 2.0 and should not be used anymore.
To add content for the whole tree, run:

  git add --all :/
  (or git add -A :/)

To restrict the command to the current directory, run:

  git add --all .
  (or git add -A .)

With the current Git version, the command is restricted to the current directory.
```

I think these fix the two `-A` flag issues. Went with the safer, more normal option. Works in my browser for this commit.