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

Fixed up grammar and spelling in README

* library's `createTx` method changed so it accepts a gas price
* dev console accepts code as well as the library

assetPath configurable on command line for ethereal GUI

- solves the problem of non-standard installs
- add AssetPath to config as string var
- introduced UiLib constructor which falls back to defaultAssetPath (earlier behaviour) if no assetPath is set
- defaultAssetPath now internal concern of UiLib
- gui.Start(assetPath) argument passed from ethereal main() as set Init() in config.go
- informative log message if wallet.qml fails to open