Fix git stash-unapply example

The example for `git stash-unapply` starts with `git stash` which will
create a new stash and not apply a stash to the working copy.  The first
command should be either `git stash apply` (which is what I changed it
to) or `git stash apply stash@{0}` or a variant thereof.
Merge pull request #916 from sauerc/master

Fix git stash-unapply example
Rename README.md to README.original.md
Create new README
Merge pull request #917 from progit/retire-progit1

Retire Pro Git 1
Merge branch 'progit/master'