0.2.1

New pre-release that primarily fixed caching expiration bug.

• Bumped minimum PHP version check to 5.4
• Added plugin.json for configuration (see Configuration & Constants)
• Fixed caching expiration bug
• Removed Carbon Fields as dependency in favor of plugin loader
• Added Utils::encrypt/decrypt helpers, WP_ENCRYPT_KEY constant (wiki)
• Added TGMPA example
• Removed Carbon Fields as Composer dependency if favor of using a separate loader plugin

NB! This plugin requires that it be loaded in order for all features/examples to work. See Dependencies for more info.