Annotate Protips with structured data

Work on https://assembly.com/coderwall/bounties/384.

Link to the image with Google Webmaster Tools results.
in ruby is not uncommon to have very long method names that describe what they are. 
for example you can see that long methods [here](http://www.ruby-doc.org/stdlib-1.9.3/libdoc/minitest/unit/rdoc/MiniTest/Unit/TestCase.html)

In this our case, we should have meta_comment_url, because mcomment can mean lot of things (mini comment, metal comment, medium comment, mike's comment :) )

Mnemonic were a necessity when storage space was expensive, nowadays we simply don't care about that unless it for embedded systems.

Ps: also use single quote when string has not interpolation.

Please take a look at 
[Ruby Style Guide](https://github.com/bbatsov/ruby-style-guide/blob/master/README.md)
[Rails Style Guide](https://github.com/bbatsov/rails-style-guide/blob/master/README.md)