bson : check string length
Merge pull request #116 from cloudwu/dev

merge dev version
update history
turn off memory hook in freeBSD
invalid length may nagtive
bugfix: in freebsd, libthr may call calloc before globalinit
check mongo reply data stream
bugfix: lua mongo result
big-endian encoding bson objectid
typo fix
release v0.3.1
Merge pull request #119 from cloudwu/dev

release v0.3.1
bugfix: double free
use skynet.error instead of print
freebsd can use malloc hook now
optimize redis compose_message, see redistest for changes

test case: start redistest
Merge pull request #124 from xjdrew/bugfix_redis

optimize redis compose_message, see redistest for changes
add module skynet.harbor
cluster.open support cluster name
minor optimize