Fixing issue with Win->IsOpen() (see ext desc)
IsOpen() was always returning true on a window that was closed on another
thread. Strange. Works now on Win32, need to do testing on X11
Merge branch 'palistov_window'

Conflicts:
	src/core/Window.cpp
Deferred renderers now part of project
Merge branch 'master' of https://github.com/palistov/bakge
Trimming trailing spaces from files.
SimpleEngine now an example
Examples are not unit tests -- they are more complex programs with their
own builds which showcase features of Bakge.
Tweaking CMakeLists
Got an SDK build working.
Outputs generated binaries and libraries to the sdk/ folder
Makefile build sdk option
Adding lib README. CMake build changed.
CMake always builds Bakge tests, examples and ALL libraries (including external ones) into the SDK output directory.
Ignoring resource files
Doc pages now markdown files
Removing old pages
Update Engine.md
Update Engine.md
Update Engine.md
Update Bindable.md
Update Renderer.md
Update CONTRIBUTE.md
Update CONTRIBUTE.md