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Fix forked `debug_traceTransaction` (#420)

This fixes the following issues:

* Web3 treats block numbers stored as hex as block hashes.

* When tracing a transaction we need to make sure the forked trie is block-number aware.

* Ensure addresses and keys are encoded properly before sending to the main node, or we may get an error back if the hex representation needs to be padded with a 0..

* When tracing a transaction the VM may ask for block by passing in a Buffer of the number instead of a hex string. Handle both.

* Don't even let the vm try to flush the a traced transaction's block's internal _cache to the stateTrie. When forking, some of the data that the traced function may request will exist only on the main chain. Because we pretty much lie to the VM by telling it we DO have data in our Trie, when we really don't, it gets lost during the commit phase when it traverses the "borrowed" data's trie (as it may not have a valid root). Because this is a trace, and we don't need to commit the data, duck punching the flush method (the simplest method I could find) is fine. Remove this and you may see the infamous Uncaught TypeError: Cannot read property 'pop' of undefined error!

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