update:

c++:
    1, apply PIMPL idiom
    2, unittest added
    3, gtest-1.7 added
    4, namespace maid::*::(Class) shorted as maid::(Class)
    5, maid::closure::Closure replaced to maid::Context,
    maid::closure::Closure never needed. define your own
    google::protobuf::Closure freely.
update:

c++:
    1, delete deprated example.