v1.0.0.alpha9

Changes since alpha8:

• Remove the Liquid Component gem dependency
• Add support for environment CLI flags (-e production or --environment=production)
• Integrate Serbea 1.0 into Bridgetown #440 (jaredcwhite)
• Add new console commands via ConsoleMethods mixin #439 (jaredcwhite)
• Support long version form in CLI (--version) #445 (Eric-Guo)

Documentation

• Skip the archived state in plugins. #443 (Eric-Guo)
• Update ruby2js as required by webpack loader #442 (Eric-Guo)