Fix issue 10

@shajoezhu I tried to simplify the autotools config, now that we no longer link to boost and other stuff. The main focus was to support more compilers and operating systems. Most importantly, I removed the `Platform specific setup` from the `configure.ac`, which was not doing much anyway. On OS X, the previous version was hard-coded to use clang, which is something that should be left to the user in my option.

What do you think about the changes? Can you try if it still works on macs? 
With this version, it is now also possible to cross-compile binaries for windows.