Annotate Protips with structured data

Work on https://assembly.com/coderwall/bounties/384.

Link to the image with Google Webmaster Tools results.
@seuros `mperson` and `maddress` are used on the profile page (https://github.com/assemblymade/coderwall/blob/master/app/views/users/show.html.haml#L18).

I made SchemaOrgHelper added TODOs. I think data-vocabulary.org urls can be easily replaced with schema.org. 
Should I do that?
Should I rename `mperson` into `meta_person_schema_url` and `maddress` into `meta_address_schema_url`?