Wallet Scrutiny Call #4: Personas, supply chains and colors

We had a wide ranging discussion about the project in this call:
- Target audiences and how we can use personas to help guide the design
- Using color in just the right away to guide, and not misguide, users
- Visualizing the steps code goes through from developer to end-user in order to better describe potential security problems
- ... and a few more things ...

Issue:
https://github.com/BitcoinDesign/Meta/issues/424