Renamed OwningVector to OwningStorage. Now uses a list instead, fixes removal while looping bug.
Merge branch 'master' of github.com:wnr/cprog13-game

# By Mathias Lindblom
# Via Mathias Lindblom
* 'master' of github.com:wnr/cprog13-game:
  Engine now has a helper method for adding Environments

Conflicts:
	src/Engine.cpp