Added support  for chunked http transfers
sf::Http now understands transfers that are sent using Chunked Transfer
Encoding (RFC 2616; section 3.6.1).
Merge pull request #337 from MarioLiebisch/chunked-http

Added support for chunked HTTP transfers
Fixed bug with sf::Texture (and especially with sf::RenderTexture) on old graphics cards (#418)
Whitespace fix
Optimized Window::waitEvent a bit (no sleep if events are available at first try)
Whitespace fix
Updated FindSFML.cmake to provide a list of 3rd-party dependencies when SFML is linked statically
Link everything static instead of just the runtime libraries.
Let CMake mirror the default behavior for the TDM compilers.