Removed zone::create and zone::destroy.
We can use zone as follows:
zone z; // on stack
zone* z = new zone; // on heap
Fixed a resource leak when zone::push_finalizer(msgpack::unique_ptr<T>) is called.
Projects that use -Wconversion don't compile due to errors in msgpack header
files. This commit fixes all the errors in msgpack-c for when -Wconversion is
enabled.
Now I can even compile msgpack-c itself with -Wconversion and all my projects:
CFLAGS=-Wconversion ./configure
make
