Removed the "protected" and "virtual" modifiers of "Dispose(bool)" when the containing type is a structure.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>
Merge pull request #37 from ddobrev/remove_protected_virtual_from_structs

Removed the "protected" and "virtual" modifiers of "Dispose(bool)" when the containing type is a structure.