Merge pull request #10 from hschoidr/master

ko/active_support_core_extension.md 파일 93번째 줄까지 번역했습니다.
translating ko/configuring.md
Merge pull request #11 from wstory2/master

translating ko/configuring.md (...)
Merge pull request #12 from hschoidr/master

added test sentences of original text.
Merge pull request #13 from hschoidr/master

added another test sentence of original text.
added a link tag to toggle original text
updated rails_guides/markdown/renderer.rb
hotfixed rails_guides/markdown/renderer.rb
hotfixed guides/rails_guides/markdown/renderer.rb
hotfixed guides/rails_guides/markdown/renderer.rb
hotfixed guides/rails_guides/markdown/renderer.rb
hotfixed guides/rails_guides/markdown/renderer.rb
hotfixed guides/rails_guides/markdown/renderer.rb
updated ko/active_support_core_extensions.md