Remove circular requires

lib/omniauth/builder.rb

@@ -1,5 +1,3 @@
-require 'omniauth'
-
 module OmniAuth
   class Builder < ::Rack::Builder
     def initialize(app, &block)

lib/omniauth/form.rb

@@ -1,5 +1,3 @@
-require 'omniauth'
-
 module OmniAuth
   class Form
     DEFAULT_CSS = <<-CSS

lib/omniauth/strategies/developer.rb

@@ -1,5 +1,3 @@
-require 'omniauth'
-
 module OmniAuth
   module Strategies
     # The Developer strategy is a very simple strategy that can be used as a

lib/omniauth/strategy.rb

@@ -1,4 +1,3 @@
-require 'omniauth'
 require 'hashie/mash'
 
 module OmniAuth