added switch between usd/eth on main page

[juliangnr90]

Hi, this is my first Pull Request, this issue came to me from Harthor (He talk to me about 1Hive). Basically what I do is to create a function that convert every USD price into ETH, first I try to get ethereum value from state. Then I use that value on every rendering of usd price.
Of course the props that I pass on components always check that exists to prevent side effect on other parts of the project.
Hope you like what I did and I'm open to any recommendation to improve the code

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[Harthor]

This works properly, it could be added also for Tokens, Pairs and Accounts tabs.