Adding materials and problems for OOP
Fixing the Hero example

- No age, health instead
Adding example classes for week2

- BankAcount (bank.py)
- BankAccounTest (bank_tests.py)
Fix the description for healing

- Take into account the maximum health
Small typos and meaning refactoring
Adding spawn and move methods to dungeon
Adding examples for spawn and move methods
Merge remote-tracking branches 'origin' and 'upstream/master'
Fixing the Orc health attribute description
Adding Dungeons and Pythons problem description
Changing boss to be Anaconda
Merge remote-tracking branches 'origin' and 'upstream/master'
Adding __pycache__ to .gitignore
Adding the problem set for week3
Fix two to three important things
Merge remote-tracking branches 'origin' and 'upstream/master'