Add schema.org tags to tools and cookbooks
Merge pull request #776 from opscode/schema-org

Add schema.org tags to tools and cookbooks
Add API endpoint for destroying cookbook versions

Adds API endpoint for destroying a single cookbook version.
Merge pull request #777 from opscode/destroy-cookbook-versions

Add API endpoint for destroying cookbook versions
Display which cookbooks are contingent upon a specific cookbook.

- New tab on the cookbook show page
- API endpoint
- Note that this is only 1 level deep in the dependency graph
add additional helper specs
satisfy rubocop
change contingents to return CookbookDependency so versions will be correct
remove the contingent header, include with dependencies