Add design goals blog post
No need to include Failures section
Include @yrashk and @alco feedback
Add Guy Steele quote, tidy up some paragraphs
Final tidy up before publishing
Merge pull request #135 from elixir-lang/jv-design-goals

Add design goals blog post
Update 2013-08-08-elixir-design-goals.markdown
Fixed the error message of the 'when comparing different types' example in 'Diving In' chapter of 'Getting Started'
Merge pull request #138 from avinasha/diving_in_error_typo

Fixed the error message of the 'when comparing different types' example ...