[ticket/11527] Upgrade composer.phar to 1.0.0-alpha7.

PHPBB3-11527
Merge branch 'ticket/11527' into ticket/11526

* ticket/11527:
  [ticket/11527] Upgrade composer.phar to 1.0.0-alpha7.
[ticket/11526] Increase composer minimum stability in olympus to stable.

PHPBB3-11526
[ticket/11526] Update all dependencies / regenerate composer.lock.

PHPBB3-11526
Merge pull request #1392 from bantu/ticket/11527

[ticket/11527] Upgrade composer.phar to 1.0.0-alpha7.
Merge pull request #1393 from bantu/ticket/11526

[ticket/11526] Increase composer minimum-stability from beta to stable
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11526] Update all dependencies / regenerate composer.lock.
  [ticket/11526] Increase composer minimum stability in olympus to stable.
  [ticket/11527] Upgrade composer.phar to 1.0.0-alpha7.

Conflicts:
	phpBB/composer.json
	phpBB/composer.lock