Add Floating and AutoIconify window hints (See go-gl/glfw3#85).
Add Floating and AutoIconify to the change log.
Merge pull request #89 from slimsag/new_window_hints

Add Floating and AutoIconify window hints (See go-gl/glfw3#85).
Merge branch 'devel_glfw3.1' of https://github.com/go-gl/glfw3

Conflicts:
	README.md