Added jQuery as it's required by bootstrap.

This fixes JavaScript errors on http://phpunit.de/manual/ and makes the "hamburger" navigation work.
Fix markup
Add target to build old editions of the documentation
Add <caution> at the top of every <chapter> of outdated editions about the fact that the edition is outdated
Closes #102
Revert "Closes #102"

This reverts commit 92585c0bf008e728bac791971fcbeac57cbcc2a6.
Closes #102
Do not display suggestions box on index page
[ja] Sync with 407735b3445e0553685ff9008527a347a4bd14a9

Add <caution> at the top of every <chapter> of outdated editions about the fact that the edition is outdated
Merge remote-tracking branch 'upstream/master'