Remove extra semicolon catched by -pedantic.
Changed #if directives to #if defined.
Typo in comment.
Fix comment.
Removed unused variable member initial_coords in class Boomerang.
Merge pull request #587 from Morwenn/remove_boomerang_initial_coords

Removed unused variable member initial_coords in class Boomerang.
Replaced Rectangle.equals but operator==.
Merge pull request #588 from Morwenn/operator_equal

Replaced Rectangle.equals but operator==.
Typo in comment.
Merge branch 'master' into cpp11
Merge branch 'cpp11' into shared_ptr