Remove contributors (resolve #12)
Some house keeping

* Use "(번역) name : title(conference)" format
* Move youtube link to movie clips
* Remove dead links
Merge pull request #13 from marocchino/remove-contributors

Remove contributors
Add markup, link checkers (resolve #14)
More house keeping

* Use user's name instead of blog name
* Remove blogs
  * en-light-en-ment : No content
  * Rails Maniac : Abandoned over a year
  * Dev.Study.Archive : Abandoned over a year
Add weirdmeetup
Merge pull request #15 from marocchino/add-checkers

Add markup, link checkers (resolve #14)
Add some ebook links and date to books
oops
Fix current version number
ruby 2.2, trailing whitespaces
Add dates (resolve #16)
Translated tags, fix joinc link
Move ruby-lang link to site