Using custom genesis (and key) files

[rigelrozanski]

With the new simplify PR to develop we've moved all the genesis info into init command. I think it makes sense to be able to use custom genesis information for 3rd party basecoin apps. for instance currently I'd like to be able to use custom tokens for the paytovote basecoin app, but can initialize accounts from genesis to use custom coin types.

Maybe we could add a flag as a part of init that will load genesis from the current directory? It will need the ability to the remove the existing genesis... and will cause chain breakage if there is already a blockchain loaded, aka unsafe_reset_all should maybe be called if this flag is used as well