delete unused feature : group/localcast/forward, etc
check callback return value for reserve the message
Merge pull request #90 from cloudwu/simplify

Simplify
add submodules jemalloc
malloc hook for jemalloc and c memory info dump
bugfix: use memcpy for unalign memory
detect JEMALLOC_OVERRIDE_MEMALIGN
add git submoudle update to makefile
check 3rd/jemalloc/autogen.sh
bugifx: clean prefix
use macro for replace malloc api (see skynet_malloc.h)
add memory lua lib
bugfix: SLOT_SIZE should be 64K
handle is uint32_t
rewrite get_allocated_field
Merge pull request #91 from cloudwu/jemalloc

Use macro for memory hook
quickfix: ssize_t
optimize global unique service query
assert service name is string
make service mgr simple