added Tournament#current_phase
created ChampionTipPresenter and partial user_tips/champion_tip
implemented uc ShowChampionTip
implemented uc ShowAllPhases
implementend uc ShowAllTipsOfAggregateForUser
refactored uc ShowAllTipsOfAggregateForUser that now sets tips and no matches anymore
refactored user_tips/show template
added responsive menu for user_tips/show phase selection