In progress
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Currently in progress is the difference view. In order to achieve this we need two "compiler" views; an "A" and "B". I'm in the progress of splitting out all the compiler-specifics into a class of sorts in the mainline, as this is a sensible refactor anyway. In the "diffs" branch I'm sketching out the UI.

Notes:

* storage in both hash tag and in local storage need to change. Specifically they are too tied to the notion of a single compiler.
* should ensure backwards compatibility: store off some hash tags and test the decode to the same view in the new scheme.


NB
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Bug with clicked URLs and race to get the list of compilers (null compiler)