Perhaps a malformed path

Hi !!!

Perhaps a malformed path in "websocketpp/common/asio_ssl.hpp" line 32
websocketpp v 0.6.0 && 0.7.x dev

``` cpp
#ifdef ASIO_STANDALONE
    #include <asio/asio/ssl.hpp> // error
#else
    #include <boost/asio/ssl.hpp>
#endif
```

``` cpp
#ifdef ASIO_STANDALONE
    #include <asio/ssl.hpp> // ok
#else
    #include <boost/asio/ssl.hpp>
#endif
```

Gérard
