Merge branch 'maint'

* maint:
  Prepare for 1.5.1.5 Release Notes
  gitweb: Add a few comments about %feature hash
  git-am: Clean up the asciidoc documentation
  Documentation: format-patch has no --mbox option
  builtin-log.c: Fix typo in comment
  Fix git-clone buglet for remote case.

diff --cc builtin-log.c
Simple merge

diff --cc gitweb/gitweb.perl
Simple merge