Remove extra semicolon catched by -pedantic.
Use nullptr instead of AL_NONE (-Wzero-as-null-pointer-constant).
Changed #if directives to #if defined.
Merge pull request #586 from Morwenn/if_to_ifdef

Changed #if directives to #if defined.
Merge branch 'cpp11' of https://github.com/christopho/solarus into point_and_size
Use foreach.
Use foreach.
Use C++ header.
Remove empty destructor.
Add override keyword to entity classes.
Add override keyword to hero state classes.
Use override keyword in low-level classes.
Use override keyword in movement classes.
Use override keyword in remaining classes.
Remove empty destructor.
Kept only the Size constructor.
Added method is_flat to Size.