Added 'base64url' mapping to choose from...#35

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PaulWay wants to merge 2 commits intorustyrussell:masterfrom PaulWay:paulway-base64-add-filesafe-map

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Commits on Oct 25, 2015

Added 'base64url' mapping to choose from (using not yet provided 'choose map' mechanism).
PaulWay
committed
Actually provide a different structure name (oops).
PaulWay
committed