[ru] chapter 2: Incorporate changes from commits 716e192 and aa83065

"Add --word-diff option description"
[ru] chapter 4: Incorporate changes from commit 192518071.

"Updated explanation of ssh protocols."
[ru] chapter 2: Translate figures.
spelling fixes, translation improvements
Merge pull request #440 from gibas/spelling-fixes

spelling fixes, translation improvements
Merge pull request #439 from GArik/RU

[ru] Sync translation with the original and translate one more figure
[ru] Update chapter 4

Fix some punctuation problems.
Merge pull request #441 from rc5hack/master

[ru] Update chapter 4
[en] Update chapter 4

Wikipedia link changes too often, so replace it with kernel.org.
Merge pull request #442 from rc5hack/en

[en] Update chapter 4
chapter 5 translation, few other translation examples added to translation-guidelines.txt
Merge pull request #444 from gibas/05-distributed-git

[pl] chapter 5 translation, few other translation examples added to translati...
Apply 1cfb0503 to all languages

A stable reference page which is not outdated for git hosting is
quite difficult to find. For the moment, just point to the one
on kernel.org.
speling fixes, added blank line between polish and oryginal text
small fix in section name
Add \usepackage{longtable} to fix 'Environment longtable undefined' problem with 'makepdfs zh'
Merge pull request #447 from gibas/spelling-fixes

[pl] small fix in section name in chapter 3
Merge pull request #446 from gibas/05-distributed-git

[pl] spelling fixes, add blank line between polish and original text
Merge pull request #448 from JulH/master

add '\usepackage{longtable}' to fix 'problem Environment longtable undefined'
Merge pull request #445 from progit/git_hosting

Apply 1cfb0503 to all languages