Updating HTML file comment with instructions on spans and extra divs
Only allow `[a-zA-Z0-9$_]` in JSON-P callback names

Ref. #31 and https://github.com/mezzoblue/csszengarden.com/pull/24/files#r4150859.
Fix include of masterlist.php in all tr/*/index.php
Merge pull request #31 from mathiasbynens/safer-jsonp

Only allow `[a-zA-Z0-9$_]` in JSON-P callback names
Merge pull request #32 from NumEricR/fix-tr-masterlist

Fix include of masterlist.php in all tr/*/index.php
Added nav elements for "archives" & "resources"

Added 2 nav elements (complemented by their ARIA roles) to the
"archives" & "resources" sections
Merge pull request #34 from GeorgeZamfir/master

Added 2 nav elements (with role="navigation") for "archives" & "resources"
just a wording change before a pull
Merge branch 'master' of github.com:mezzoblue/csszengarden.com
Rolling back resources <nav> element, white space
Breaking up index.php into language, template and control file in prep for i18n
Adding french translation to new setup, ready for fixes
Removing acronym references, validating
Removing translation blank
Merging in master