Feed Tamagotchi

[rafaelhenrique]

Based on class described here:
https://groups.google.com/forum/#!topic/python-sorocaba/w2EvUun-NHQ

• Implement POST method to feed Tamagotchi
• Implement GET method to know if the Tamagotchi has hungry

[rafaelhenrique]

One PR for this issue is only accepted if have tests and Coverage > 90%.