fix a compile warning

This patch fixes a compile warning in a build system where the macro __STDC_LIMIT_MACROS is predefined.
Merge pull request #56 from huahang/patch-6

fix a compile warning
Use MCHECK in ThreadLocal.h

Fixed issue #54.
增加操作64位整数的方法
retained prev commit
Merge pull request #59 from gamedevelope/master

add 64bit function for Buffer
Merge branch 'master' of github.com:chenshuo/muduo