Minor

• Add no-index (#152)
• normalize from metadata to ensure leading slash
• create redirects.json file
• HTML encode ellipsis

Development

• Target Ruby 2.1
• Test against GitHub Pages Ruby version (#132)
• Fix tests for jekyll 3.5.x (#160)
• Define path with dir (#161)
• Fix Rubocop offenses (#165 )
• Standardize scripts