Added a Simple Left/Right Animation example to the WPF/E pages

Very basic example, but in the course of putting this up, I had to work through getting an agHost object squirted into my content page from the database.

Now that I've worked that out, I can have better examples with running code in addition to exposed xaml.

http://www.wynapse.com/WPFE/Tutor/Simple_WPFE_Left_Right_Animation.aspx
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