0.3.0-rc1

• Bumped minimum PHP version to 5.6
• Added Gulp for task automation (SASS, JS processing)
  • Added gulp rename task (notes)
• Added Bower to (optionally) load third-party scripts
• Drastically refactored configuration management
• Split out settings pages, shortcodes, CPT & widgets into separate files/classes (thanks obstschale)
• Added wp-pot-cli to create .pot translation file
• Added npm run zip to package plugin as ZIP file
• Added register_uninstall_hook to delete Carbon Fields settings when plugin uninstalled
• Added Ajax example "Clear Cache" link to admin bar dropdown
• Added wordpress-settings-api-class settings page example
• Added WPTK_DISABLE_CACHE constant
• Added VERSION constant
• Added wordpress-toolkit as dependency
• Renamed Utils class to Helpers