Merge branch 'hotfix/2.5.1'
Merge branch 'release/2.6.0'
Merge branch 'release/2.6.1'
Merge branch 'release/2.7.0'
Shinier, newer badges.
Changed dollar sign to a full word

Related to: https://github.com/bobthecow/mustache.php/issues/241
Merge pull request #243 from LostKobrakai/master

Changed dollar sign to full word
Plural, too :)
Add hhvm-nightly to Travis config.
Update php-cs-fixer config.
Fix bin/create_example CS
Better dev dependencies.

 * Add dependency on php-cs-fixer, since we use it.
 * Add a useful PHPUnit dependency version.