Merge pull request #16 from jdfreder/notebook-docs

Updated widget tutorial,
Adding widget diagrams.
More updates
	renamed:    FrontendKernel.graffle/data.plist -> ../../images/FrontendKernel.graffle/data.plist
	renamed:    FrontendKernel.graffle/image1.png -> ../../images/FrontendKernel.graffle/image1.png
	renamed:    FrontendKernel.png -> ../../images/FrontendKernel.png
Added images