Add 3.1 support and extension type.
MOD Team => Extensions Team.
Fix typo "modication" => "modification".
Add the whole store/ directory to .gitignore.
[ticket/613] Fix array to string conversion error in contribution.php.

CUSTDB-613
Merge branch 'master' into phpbb-com

* master:
  [ticket/613] Fix array to string conversion error in contribution.php.
  Add the whole store/ directory to .gitignore.
  Fix typo "modication" => "modification".
  MOD Team => Extensions Team.
  Add 3.1 support and extension type.

Conflicts:
	titania/.htaccess