Fixed freed memory accessing bug.

(Issue #32)

Fixed buffer leak bug.

In the case of the function next() returns true:
Whichever the argument result is holding the zone or not, the ownership of the zone always should be delegated from 'unpacker' to 'unpacked'.

In the case of the function next() returns false:
Whichever the argument result is holding the zone or not, the members of 'unpacked' should be reset.

Added the casts for the byte data.

Added copyright.

Fixed malloc delete unmatch bug.

added return value checking.

fixed a typo in a comment

Add README syntax highlighting

Update README.md

fix typos

refs #8

fixes #3
fixes #15

__gnu_cxx::__exchange_and_add returns OLD, not NEW value

When doing streaming deserialization, valgrind complains about mismatched free()...
It's caused by calls to auto_ptr::free for zones that are null pointers.

The patch add serialization operator for the given enum to avoid the use
of a cast which leads to strict-aliasing warnings and the test to fail.

Solution suggested by qehgt.

This commit includes a pull request from polrop(ignore-cpp-bootstrapped-files branch).

Update ruby/compat.h

The exceptions for Rubinius are unnecessary now and are actually
causing msgpack not to install due to the incorrect function prototypes
that are in this file. In MRI, this is the prototype

  VALUE rb_gc_enable();

Anyway, these are unnecessary for Rubinius.