Make text style in "Gitolite" section consistent with other sections.
Fix inconsistency between an example and its description
Change 'authorisation' to 'authorization'

as SSH has 'authorized_keys' file.
Make Gitolite setup examples clearer.

Also replace 'sitaram' username with 'scott' for the sake of consistency.
msysGit moved from Google Code to GitHub

Updated old URLs with:

  sed -i 's|http://code.google.com/p/msysgit|http://msysgit.github.com/|'
    */01-introduction/01-chapter1.markdown
[es-mx] Remove Spanish (Mexico) translation

This translation was copied verbatim from en in 02f9838 (as the
398db5e blob, which was added by b26a581).  All subsequent changes
have been tree-wide, so we don't lose any information by removing the
translation.  Future translators should seed their efforts with an
up-to-date branch from another language.
Mention --oneline in Table 2-2

`--pretty=oneline` is useful for explaining `--pretty`, but
`--oneline` is easier to type and its output is easier to read.
Add backticks around `git fetch pb` in section 2.5.

Following the example of the preceding `git remote add`.
Merge pull request #373 from wking/git-fetch-pb-markup

Add backticks around `git fetch pb` in section 2.5.
Merge pull request #372 from wking/oneline

Mention --oneline in Table 2-2
Merge pull request #371 from wking/remove-es-mx

[es-mx] Remove Spanish (Mexico) translation
Merge remote-tracking branch 'wking/msysgit-at-github'
Merge pull request #369 from GArik/EN

Corrections to the Gitolite section