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images/stencil3x3 update

highlight the central element orange, same as the other stencil graphic
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sec 1: add some examples of Accelerate's use externally
sec 6: caption wibble (missing short text)
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capitalise Section when cross referencing

* matches use of Figure, Table, Listing, etc.
sec 3: wibble
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Change thesis title

* A large part of the contribution is the backend implementation and runtime system, which don't constitute optimisation via program transformation, per-se.
* The thesis is really about optimising the *entire* GPU program, including program optimisation and runtime system.
* Something that wasn't our last paper title might be better though...
sec 1 wibble
sec 5: copy edits
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copy edits