Locations unification

* include/EventArea.hpp
Changed references returns to pointers (in location getters).

* include/sim_crowd/World.hpp
Deleted 'locations_'. Use vectors from EventArea.

* include/sim_crowd/types.hpp
Deleted EVENT type.

* src/EventArea.cpp
Consequence of above.

* src/sim_crowd/World.cpp
Fixes related to deleting 'location_' in World. Rewritten getNearest().
Merge branch 'master' of github.com:tphaster/sim-crowd