Tutorial update

[smfang]

Tutorial updates:

1. Improve tutorial (readme) documentation
   a. Testing out tutorial and getting user feedback on common error
   b. Hold small demo sessions on running truebit OS and issuing tasks
   c. Ensure onboarding steps for primary user (ETH developers) is clear and errors minmized
   d. Direct users to Gitter for technical support
2. Review incentive layer and network economics
   a. Model and review economic incentive for individual ecosystem actors
   b. Produce short Medium explainer on network ecomics
3. General communication
   a. Create short Medium article version of the Truebit tutorial after Added some lines to the components section #1 has been finalized.