There are two ways of changing git configuration options

1) using "git config" to change the current repository's configuration, and
"git config --global" to change global configuration.

2) Editing $GIT_TOPDIR/.git/config (.git can be found with "git rev-parse
--git-dir") to change the current repository's configuration, and editing
~/.gitconfig for the global configuration.

You can list all currently set configuration options with "git var -l".

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Config options which should be set for the Crawl repository, but probably
shouldn't be global config options:

* Always rebase when doing a pull:
      git config branch.master.rebase true

* Always rebase when setting up a new branch:
      git config branch.autosetuprebase always

* Don't translate line endings to the native format.  Necessary for
  Visual Studio projects:
      git config core.autocrlf false

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Some useful config options:

* Automatically colour all output which can be coloured:
      git config --global color.ui auto

* Automatically fix whitespace problems in a patch if using the
  "apply" command:
      git config --global apply.whitespace fix

* Use more than one thread for packing when doing a push or gc.
  Useful on multi-processor or dual-core machines:
      git config --global pack.threads 2