Embedded Markdown typesetter using Redcarpet.
CSS added.
Style updates - pre, code.
Documentation work.
Documentation updates.
IRB now embedded.
Dialog simplified.
Moved graphics functions to lib/tinker/graphics.rb.
Moved GUI functions to lib/tinker/gui.rb.
Style changed.
Slight modification.
Documentation updates.
Added point(). Bug in rect() fixed.
First sketch of plot().
Added sound system.
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