Start Level 8
RubyWarrior::Turn#look is now available

* Deleted Warrior::Sight#look
* Renamed Warrior::Sight#look_for to Warrior::Sight#feel_for
Finish Level 8
Refactor Warrior::Sight#look_for and #feel_for
Merge pull request #13 from rafaelgonzalez/level-8

Finish Level 8