gitignore.txt: fix documentation of "**" patterns

"**" means bold in ASCIIDOC, so we need to escape it.

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'jc/revision-range-unpeel' into maint

"git rev-list --objects ^v1.0^ v1.0" gave v1.0 tag itself in the
output, but "git rev-list --objects v1.0^..v1.0" did not.

* jc/revision-range-unpeel:
  revision: do not peel tags used in range notation
Merge branch 'jk/split-broken-ident' into maint

The fall-back parsing of commit objects with broken author or
committer lines were less robust than ideal in picking up the
timestamps.

* jk/split-broken-ident:
  split_ident: parse timestamp from end of line
Merge branch 'sg/prompt-svn-remote-fix' into maint

Bash prompting code to deal with an SVN remote as an upstream
were coded in a way not supported by older Bash versions (3.x).

* sg/prompt-svn-remote-fix:
  bash prompt: don't use '+=' operator in show upstream code path
Merge branch 'mm/checkout-auto-track-fix' into maint

"git checkout topic", when there is not yet a local "topic" branch
but there is a unique remote-tracking branch for a remote "topic"
branch, pretended as if "git checkout -t -b topic remote/$r/topic"
(for that unique remote $r) was run. This hack however was not
implemented for "git checkout topic --".

* mm/checkout-auto-track-fix:
  checkout: proper error message on 'git checkout foo bar --'
  checkout: allow dwim for branch creation for "git checkout $branch --"
Merge branch 'hn/log-graph-color-octopus' into maint

Coloring around octopus merges in "log --graph" output was screwy.

* hn/log-graph-color-octopus:
  graph: fix coloring around octopus merges
Merge branch 'jk/subtree-install-fix' into maint

We did not generate HTML version of documentation to "git subtree"
in contrib/.

* jk/subtree-install-fix:
  subtree: add makefile target for html docs
Merge branch 'vd/doc-unpack-objects' into maint

The synopsis section of "git unpack-objects" documentation has been
clarified a bit.

* vd/doc-unpack-objects:
  Documentation: "pack-file" is not literal in unpack-objects
  Documentation: restore a space in unpack-objects usage
Merge branch 'sc/doc-howto-dumb-http' into maint

An ancient How-To on serving Git repositories on an HTTP server
lacked a warning that it has been mostly superseded with more
modern way.

* sc/doc-howto-dumb-http:
  doc/howto: warn about (dumb)http server document being too old
Start preparing for 1.8.4.3

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Sync with maint

* maint:
  Start preparing for 1.8.4.3
  gitignore.txt: fix documentation of "**" patterns