Change: STDOUT.sync = true
Fix Gemfile to use 'https://rubygems.org'
help wanted
Normalize markdown extension

There are a ton of extension options for Markdown. Should we choose just one for
consistency?
Merge pull request #233 from bbauer/normalize_markdown_extension

Normalize Markdown Extension
Merge pull request #174 from giraffi/sync_stdout

Change: STDOUT.sync = true
Merge pull request #202 from ouranos/fix_gemfile_source

Fix Gemfile to use 'https://rubygems.org'
Update README.markdown

Changed incorrect YAML array syntax.