Removed incorrect comment
Toolkit.Init() now returns a concrete class

This gives us room for expansion in the future, if necessary.
Fixed #5

We need to release the cursor before closing a GameWindow, otherwise
subsequent GameWindows may fail to receive mouse events.
Destroy SDL window when finalized

SDL_DestroyWindow must be called on the main thread. If the window is
finalized, the finalizer will push a CLOSE event to the event loop
(thread-safe) and the window will be destroyed on the main thread.
Fix exceptions on reused OpenGL context handles

Implementations may reuse OpenGL context handles that have been
destroyed. If a context is finalized but not Disposed, then OpenTK may
keep a reference to the old context handle, causing a crash when the
same handle is returned for a new context. To fix that, new context
handles will now replace old handles in case of a clash.
Updated build instructions.
Updated todo list
Updated release notes