Issue #2248383 by ryan.armstrong: Get all setting defaults into YAML file.
Issue #2247445 by Mark Carver | ryan.armstrong: [META] Refactoring Bootstrap Theme Registry.
Issue #2247445 by Mark Carver | ryan.armstrong: [META] Refactoring Bootstrap Theme Registry.
Issue #2251797 by m1r1k: Get rid of deprecated theme() function.
Issue #2251775 by m1r1k: Get rid of variable_get() function.