Merge branch 'jc/log-stdin'

Merge branch 'jc/log-stdin'

* jc/log-stdin:
  Add trivial tests for --stdin option to log family
  Make --stdin option to "log" family read also pathspecs
  setup_revisions(): do not call get_pathspec() too early
  Teach --stdin option to "log" family
  read_revision_from_stdin(): use strbuf

Conflicts:
	revision.c