[ticket/11320] Include functions file as we need phpbb_convert_30_dbms_to_31

PHPBB3-11320
[ticket/11321] Recreate schema files with develop/create_schema_files.php

PHPBB3-11321
Merge remote-tracking branch 'nickvergessen/ticket/11321' into develop

* nickvergessen/ticket/11321:
  [ticket/11321] Recreate schema files with develop/create_schema_files.php
[ticket/11324] Add PHP 5.5 environment to travis and allow it to fail.

PHPBB3-11324
Merge remote-tracking branch 'EXreaction/ticket/11320' into develop

* EXreaction/ticket/11320:
  [ticket/11320] Include functions file as we need phpbb_convert_30_dbms_to_31
Merge PR #1191 branch 'bantu/ticket/11324' into develop-olympus

# By Andreas Fischer
# Via Andreas Fischer
* bantu/ticket/11324:
  [ticket/11324] Add PHP 5.5 environment to travis and allow it to fail.
Merge PR #1191 branch 'develop-olympus' into develop

# By Andreas Fischer
# Via Andreas Fischer (1) and Oleg Pudeyev (1)
* develop-olympus:
  [ticket/11324] Add PHP 5.5 environment to travis and allow it to fail.