Compile errors VS2013 with ASIO standalone

[mjsp]

Fabulous library.
After defining the necessary macros for asio-standalone compilation, I had two issues:

transport/asio/security/tls.hpp still referred to the boost-specific error code:
'lib::error_code translate_ec(boost::system::error_code ec) {'
Changing 'boost::system::error_code' to 'lib::asio::error_code' resolves this for me.

common/asio_ssl.hpp refers to 'asio/asio/ssl.hpp':

ifdef ASIO_STANDALONE

#include <asio/asio/ssl.hpp>

but I believe this needs to be 'asio/ssl.hpp', consistent with everywhere else.

[zaphoyd]

I've pushed an update to the develop branch that may address this. I'll do some more testing, but if you are able to as well that would be useful.