Merge pull request #13 from etripier/master

Implemented Receive tab functionality to view all user addresses
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Merge pull request #18 from waffle-iron/master

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Cleared local storage
Checkpoint before implementing testnet generation and save of addresses
Started implementing new LocalStorage design to store testnet keys and addresses
Helper functions in local storage written
btclib directory set up
Update popup.html to accomodate btclib directory structure
Merge pull request #19 from JackTanRoo/feat/setNetwork

Implement new directory structure to prepare for tests
Refactored to allow toggling between TestNet and MainNet