Update mix umbrella chapter with new options
Update 2013-07-13-elixir-v0-10-0-released.markdown

Fix CHANGELOG link.
Merge pull request #163 from cris/patch-1

Update 2013-07-13-elixir-v0-10-0-released.markdown
Update ecto docs
fix documentation for importing just macros/functions
Fix "supervisors" typo in Mix Getting Started guide
Merge pull request #165 from skattyadz/master

Fix "supervisors" typo in Mix Getting Started guide
Merge pull request #164 from reset/import-fix

fix documentation for importing just macros/functions