* Add Concurrently and BrowserSync for live reload

* Plugin manifest for Gem-based content (thems, etc.)

* Add auto-reload functionality for local plugins

* Additional improvements to support plugin reloading

* Refactor hooks and support reloading via the watcher

* Add unit tests for PluginSourceManifest etc.

* New plugins CLI

* Gotta stick with yield_self for Ruby 2.5

* Add support for the upcoming SiteBuilder abstract class

* First pass at integrating Builder DSL

* Fix SiteBuilder instantiation logic

* Add scripts and Rubocop config to Builder gem

* Set up classes with autoload for performance

* Reformat builder code using Rubocop guidelines

* Rename classes and hooks for best usage

* Data hashes are now HashWithIndifferentAccess

* Remove unnecessary hash utils

* remove test file

* Move DSL into mixins, add Builder test suite

* Add Builder to local Gemfile

* Add additional Builder tests

* Test the automatic instantiation of SiteBuilder

* Add convenience method to PluginManager

* Allow method symbols as alternative to blocks

* Simplify and don't use instance_exec for generators/tags

* define_singleton_method to the rescue!

* Move HTTP DSL to mixin and add tests

* Update begin/rescue blocks to Ruby 2.5