Annotate Protips with structured data

Work on https://assembly.com/coderwall/bounties/384.

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A controller will only the helper that match it name and parent class.
eq : ProtipController , will have ProtipHelper and ApplicationHelper available because ProtipController is a inherit from ApplicationController. 
The SchemaOrgHelper will never be included unless we have a SchemaOrgController, that why we included it in ApplicationHelper.