Merge branch 'jc/add-addremove'

* jc/add-addremove:
git-add --all: documentation
git-add --all: tests
git-add --all: add all files
builtin-add.c: restructure the code for maintainability

Conflicts:
builtin-add.c

diff --cc builtin-add.c
index 0800b14ac6b8bcc439f1c51c97f1fbc3ad61b79d,6f5672a6161e9fb1ad8db044e1c318f7594e9e10..fc3f96eaefff91e4e85adb92162716939f0ecd72
--- 1/builtin-add.c
--- 2/builtin-add.c
+++ b/builtin-add.c
@@@ -140,10 -140,7 +140,8 @@@ static void refresh(int verbose, const 
        for (specs = 0; pathspec[specs];  specs++)
                /* nothing */;
        seen = xcalloc(specs, 1);
-       if (read_cache() < 0)
-               die("index file corrupt");
 -      refresh_index(&the_index, verbose ? 0 : REFRESH_QUIET, pathspec, seen);
 +      refresh_index(&the_index, verbose ? REFRESH_SAY_CHANGED : REFRESH_QUIET,
 +                    pathspec, seen);
        for (i = 0; i < specs; i++) {
                if (!seen[i])
                        die("pathspec '%s' did not match any files", pathspec[i]);