[ticket/12347] Changed to the new navbar templates

PHPBB3-12347
[ticket/12347] Changed from :after to :before

PHPBB3-12347
[ticket/12347] IE8 compatible CSS selector

PHPBB3-12347
[ticket/12423] Increase Composer minimum-stability to stable.

PHPBB3-12423
[ticket/12423] Move PHP CodeSniffer from non-stable 1.5.0RC4 to latest 1.5.2.

PHPBB3-12423
[ticket/12424] Update Symfony component from v2.3.4 to v2.3.12.

PHPBB3-12424
[ticket/12347] Remove unknown/unnecessary hack

PHPBB3-12347
Merge remote-tracking branch 'PayBas/ticket/12347' into develop-ascraeus

* PayBas/ticket/12347:
  [ticket/12347] Remove unknown/unnecessary hack
  [ticket/12347] IE8 compatible CSS selector
  [ticket/12347] Changed from :after to :before
  [ticket/12347] Changed to the new navbar templates
Merge pull request #2334 from bantu/ticket/12423

Stable Composer Minimum Stability + Some Composer Dependency Updates

* bantu/ticket/12423:
  [ticket/12424] Update Symfony component from v2.3.4 to v2.3.12.
  [ticket/12423] Move PHP CodeSniffer from non-stable 1.5.0RC4 to latest 1.5.2.
  [ticket/12423] Increase Composer minimum-stability to stable.