Add overload for socket::set(socket_option const&, const char *)

[ahmedtd]

When setting a socket option like:

mysocket.set(socket_option::subscribe, "myprefix");

the C++ standard requires that the bool override for set be considered before the std::string override. This causes the above code to fail by throwing an exception that complains that a bool option is being set with a non-bool value.

An explicit override for const char * will capture the literal properly.

[benjamg]

Thanks, clearly I never had tests for setting these options directly (always going via the helper functions).

[ahmedtd]

Wow, thanks for the quick response. I'm loving the bindings, by the way.

[benjamg]

Your welcome. If you spot any other bugs, or have suggestions feel free to raise issues (or code patches)