Prevent circular reference error in Banzai

lib/banzai/filter/table_of_contents_filter.rb

-require 'banzai'
 require 'html/pipeline/filter'
 module Banzai

lib/banzai/filter/task_list_filter.rb

-require 'banzai'
 require 'task_list/filter'
 module Banzai

lib/banzai/filter/upload_link_filter.rb

-require 'banzai'
 require 'html/pipeline/filter'
 require 'uri'

lib/banzai/filter/user_reference_filter.rb

-require 'banzai'
-
 module Banzai
   module Filter
     # HTML filter that replaces user or group references with links.

lib/banzai/lazy_reference.rb

-require 'banzai'
-
 module Banzai
   class LazyReference
     def self.load(refs)

lib/banzai/pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     def self.[](name)

lib/banzai/pipeline/asciidoc_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class AsciidocPipeline < BasePipeline

lib/banzai/pipeline/atom_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class AtomPipeline < FullPipeline

lib/banzai/pipeline/base_pipeline.rb

-require 'banzai'
 require 'html/pipeline'
 module Banzai

lib/banzai/pipeline/combined_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     module CombinedPipeline

lib/banzai/pipeline/description_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class DescriptionPipeline < FullPipeline

lib/banzai/pipeline/email_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class EmailPipeline < FullPipeline

lib/banzai/pipeline/full_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class FullPipeline < CombinedPipeline.new(PlainMarkdownPipeline, GfmPipeline)

lib/banzai/pipeline/gfm_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class GfmPipeline < BasePipeline

lib/banzai/pipeline/note_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class NotePipeline < FullPipeline

lib/banzai/pipeline/plain_markdown_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class PlainMarkdownPipeline < BasePipeline

lib/banzai/pipeline/post_process_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class PostProcessPipeline < BasePipeline

lib/banzai/pipeline/reference_extraction_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class ReferenceExtractionPipeline < BasePipeline

lib/banzai/pipeline/single_line_pipeline.rb

-require 'banzai'
-
 module Banzai
   module Pipeline
     class SingleLinePipeline < GfmPipeline

lib/banzai/reference_extractor.rb

-require 'banzai'
-
 module Banzai
   # Extract possible GFM references from an arbitrary String for further processing.
   class ReferenceExtractor