fix the build error(warning) in g++ 4.7.2(x64)

building error is following:
ontrol.cc:82:40: error: narrowing conversion of 'supported_compilers.std::vector<_Tp, _Alloc>::size<const Compiler*, std::allocator<const Compiler*> >()' from 'std::vector<const Compiler*>::size_type {aka long unsigned int}' to 'uint32_t {aka unsigned int}' inside { } is ill-formed in C++11 [-Werror=narrowing]
Update oj.conf

the port after the client_ip never be used in practice.
Update compile.sh
Update compile.sh
add c++0x option
add c++0x
update sql of language
Merge pull request #8 from ZhouYuChen/master

add C++0x option