Adds default front-matter support for collecitons
Includes tests for frontmatter defaults in documents
Passes the url to FrontmatterDefaults.all instead of full path
Adds the missing tests for #2405
Adds an example how to use frontmatter defaults with collections
Fixes the extra indentation in cucumber test
Bump pygments.rb to 0.6.0.

Closes #2504.
Update history to reflect the closing of #2504. [ci skip]
Merge pull request #2419 from jens-na/collection-defaults
Update history to reflect merge of #2419 [ci skip]
Run Rubocop on our codebase.
Add Rubocop to help maintain code style
Fixing use of deprecated class methods

Updates File.exists? to File.exist?
Set rubocop to ensure end alignment with variable
Fixing block variable shadowing outer local variable
Prepending underscore to unused block variables
Disable checking of unused method arguments
Using && and || in place of styleguide 'banned' words
Removes trailing whitespace
Remove trailing comma