update with new avboost
sync avhttp
delete clean_cache, there is no longer needed

move loop code to webqq_loop.cpp
some name tweak
remove update_group_list as webqq member function
fix nick fromat, reported by huntxu
pull soci fix  :)
with new soci fix, it is now the time to remove sqlite3_enable_shared_cache
style
BOOST_SYMBOL_VISIBLE 来控制。

将来可能build为 DLL 呢！另外默认使用 visibility=hidden 将减少符号表的大小。
avhttp now have cookie parser code

with avhttp now have cookie parser code, avbot shall use that instead of
its own stupid parser.
print start polling messages!
print stoped polling messages
avhttp sync, and cookie_mgr.hpp style
move rpc into subdir rpc/

prepare for the forth comming complex rpc protocol
add stub for /status rpc
add avhttp
fix build error
pull in avhttp fix
pull in avhttp fix