Added example how to set up new APIs

* Instead of a theoretical example, I added
*Dribbble.com API example from the Example file together with detailed
descrtipion on new API configuration, mapping and making some basic API
calls.
Added config to response middlewares to APIs example

Based on improvements to the code in the Example file, I added
configuration to response middlewares to the "Adding new APIs" part of the
file illustrating configuration of Dribbble.com
Merge pull request #42 from IevaLek/master

Added example how to set up new APIs