README: symlink from README.md

It looks better as markdown than rendered as text via the markdown tool,
so just symlink it.

Signed-off-by: Sage Weil <sage@redhat.com>
README.md: word wrap

Signed-off-by: Sage Weil <sage@redhat.com>
rocksdb: fix i386 build

Signed-off-by: Sage Weil <sage@redhat.com>