fast_404 7.x-1.5

• #2160725: Unknown modifier 'd' fast_404.inc:70
• #1322070: fast404 make advanced_help module path to */README.TXT unavailable
• #2384811: Write tests
• #2123321: [i18n] language prefix doesn't get recognized
• #2279169: Add variable to disable fast_404 during development
• #2114479: Ignore drush calls
• #2078863: Provide PDO db access in fast_404_path_check [patch attached]

This release puts the PDO driver into a release of fast_404. The aim of this is to standardise across all database formats allowing PgSQL and SQLite to participate in the fast 404 goodness.