Fix buffer size to ensure#216

Merged

komamitsu merged 2 commits intomsgpack:v07-developfrom

xerial:v07-fix-packstring

Apr 9, 2015

Commits on Apr 8, 2015

Fix buffer size to ensure
xerial
committed

Commits on Apr 9, 2015

Avoid allocating too large bufffer when unpacking string
xerial
committed