Fitbit workshop: User experience (UX)

[ninabreznik]

@todo

• [x] #23 use public test chain, it need to waiting very long time to get callback.
• [x] #22 oraclize often out of gas, it is hard to test.
• [x] #35 fitbit presentation - change requests

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The goal is to code a dapp (solidity + frontend) that pulls data from a regular web API.