links open in external window via subclass or Redcarpet renderer
Merge branch 'master' into feature/62/external-links

Updating to master no changes in branch
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the commit.
moved subclassed Redcarpet::Render::HTML to config/initialiers and added comments
Merge pull request #32 from lighthouse-labs/feature/62/external-links

links open in external window via subclass of Redcarpet renderer