External applications now accept containers which function as the
frontend where the ExtApplication functions as the backend. Containers
execute within their own engine and have their own context and are
destroyed when released.

PreProcess moved to Mutan package

* UI Now updates when a new block has been broadcasted
* Added a on, off and trigger

- add -y flag for non-interactive use
- refactor main
- output to logfile (not ideal..) but not to all ethutil loggers for privacy

- add logfile option to ethereum client flags
- fallback to StdOut
- Logger appended to ethutil.Config.Log loggers
- wrapper uses ethutil.Config.Log