Automagic creation of test accounts and funding

[mikeshultz]

The best solution may be to add a setting to networks.yml that allows accounts to be auto created and funded as needed. That would remove the whole block of code that solidbyte-test-project uses to autofund the deployer_account.

Possibly relevant to #79. Originally from #77.

[mikeshultz]

Something brought up in #49. I think this may be a better solution. Adding this to provide to deploy scripts instead of adding some magic setting makes the user do it explicitly.

autofund_account(address, value) so a local secret store account can be quickly funded for use with eth_tester or Ganache.