What's on git.git "master" (1/2)

* The 'master' branch has these since the last announcement.

(this is only the first half of "master" -- I am bisecting)

 - Misc Fixes and Enhancements

   Dennis Stosberg:
      git-clean fails on files beginning with a dash
   Dmitry V. Levin:
      execv_git_cmd: Fix stack buffer overflow.
      git_exec_path, execv_git_cmd: ignore empty environment variables
   Paul Mackerras:
      Make git-diff-tree indicate when it flushes
   Salikh Zakirov:
      Fixed Cygwin CR-munging problem in mailsplit
   Shawn Pearce:
      Allow multiple -m options to git-commit.

 - Tests and Documentation

   Eric Wong:
      t3300-funny-names: shell portability fixes
      tests: Remove heredoc usage inside quotes
      t5500-fetch-pack: remove local (bashism) usage.
      t6000lib: workaround a possible dash bug
   Horst von Brand:
      Fix some documentation typoes
   J. Bruce Fields:
      documentation: mention gitk font adjustment in tutorial
      documentation: add brief mention of cat-file to tutorial part I
      Documentation: retitle the git-core tutorial
      Documentation: fix a tutorial-2 typo
   Shawn Pearce:
      Remove unnecessary output from t3600-rm.
      Improved pack format documentation.