fix for static builds with mingw-w64 compilers - part 1
fix for static builds with mingw-w64 compilers - part 2
Minor indentation correction
Improved the API documentation stylesheet
Fixed joysticks not detected when checked at application startup.
Minor addition in the API documentation
Added Unicode window title support.

- Changed SFML API to receive an sf::String as the window title instead
  of a std::string (in Window::Window and Window::setTitle).
- Changed RenderWindow and WindowImpl APIs accordingly.
- Changed WindowImplWin32 to use a Unicode window title only if the
  target OS supports it.
- Changed WindowImplCocoa to always use Unicode window titles and added
  a utility function to Window/OSX/cpp_objc_conversion.mm.
- Changed WindowImplX11 to set the Unicode window title as part of the
  _NET_WM_NAME specification, which sadly is not part of the official X
  standard, but the closest anything can get. Still set regular ASCII
  title as fallback.
Simplified UTF-8 encoding procedure for X11 window title.

- Instead of first converting to a wide string and converting that to
  UTF-8, now convert to UTF-8 directly using sf::Utf32::toUtf8.
- Modify OS X sf::String to NSString helper to work for big-endian
  architectures (like OS X 10.5 on PowerPC) as well.
Fixed tiny style issues.
Merge pull request #351 from Shizmob/master

Unicode window title support.
Merge pull request #218 from BMBurstein/master

fix for static builds with mingw-w64 compilers
Added x64 binaries for MinGW and adapted the CMake file.
Merge pull request #356 from eXpl0it3r/master

Added external libraries for MinGW x64 compilers
Added source file groups in CMake files (for better organization of sources when opening SFML projects in IDEs)
Fixed: outline direction were depending on the order in which points were defined in a Shape
Organized projects into folders, for IDEs that support it (e.g. Visual Studio)
Added repeating to sf::RenderTexture

Added the missing setRepeated() and isRepeated() methods to sf::RenderTexture.
Merge pull request #363 from Foaly/repeatedRenderTexture

Added repeating to sf::RenderTexture