Merge branch 'master-for-junio' of git://repo.or.cz/git/fastimport; branch 'maint'

* 'master-for-junio' of git://repo.or.cz/git/fastimport:
fast-import: Fail if a non-existant commit is used for merge
fast-import: Avoid infinite loop after reset

* maint:
Fix diff-options references in git-diff and git-format-patch
Add definition of <commit-ish> to the main git man page.
Begin SubmittingPatches with a check list
fast-import: Fail if a non-existant commit is used for merge
fast-import: Avoid infinite loop after reset

diff --cc Documentation/git-diff.txt
Simple merge

diff --cc Documentation/git.txt
Simple merge