Arbitrum bridge functions (DO NOT MERGE)#3

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willjgriff wants to merge 6 commits intomasterfrom

arbitrum-bridge-functions

Commits on Jul 7, 2021

Commits on Jul 22, 2021

Add doc string, add correct chain id.
willjgriff
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Accept bridge in constructor. Use external address (not self/this) to hold bridgeable tokens.
willjgriff
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Commits on Aug 17, 2021

Add tests for bridging functionality
willjgriff
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Commits on Sep 21, 2021

Update check in claim tokens function.
willjgriff
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