segfault on linux

[jeremie-lg]

Hi,
i think there's an error in the function MemoryMapped::close() on Linux system. When you don't remap the whole file, a SIGSEGV error is return by munmap() (MemoryMapped ln 156). I suggest to change ::munmap(_mappedView, _filesize); by ::munmap(_mappedView, _mappedSize); to fix this error.

jérémie