Moves omniauth/core to just plain omniauth

lib/oa-core.rb

@@ -1 +0,0 @@
-require 'omniauth/core'

lib/omniauth/builder.rb

@@ -1,4 +1,4 @@
-require 'omniauth/core'
+require 'omniauth'
 
 module OmniAuth
   class Builder < ::Rack::Builder

lib/omniauth/form.rb

@@ -1,4 +1,4 @@
-require 'omniauth/core'
+require 'omniauth'
 
 module OmniAuth
   class Form

lib/omniauth/strategy.rb

@@ -1,4 +1,4 @@
-require 'omniauth/core'
+require 'omniauth'
 
 module OmniAuth
   class NoSessionError < StandardError; end

spec/spec_helper.rb

@@ -2,7 +2,7 @@ require 'simplecov'
 SimpleCov.start
 require 'rspec'
 require 'rack/test'
-require 'omniauth/core'
+require 'omniauth'
 require 'omniauth/test'
 
 RSpec.configure do |config|