Fix issue #20

[aikchar]

I searched for how to determine big vs little endianness in C++ and substituted the test with the first reasonable thing I found at https://stackoverflow.com/a/1001330.

    You can do it by setting an int and masking off bits, but probably the easiest way is just to use the built in network byte conversion ops (since network byte order is always big endian).

    if ( htonl(47) == 47 ) {
      // Big endian
    } else {
      // Little endian.
    }

    Bit fiddling could be faster, but this way is simple, straightforward and pretty impossible to mess up.