Remove storage
Add dependency on spring-core for Environment support
Introduce BitsquareEnvironment
Use JOpt
Further configure JOpt
Further configure options
Get rid of ArgumentParser
Remove unused BootstrapNode#stop method
WIP
Refine Executable
Move app.{gui=>}.BitsquareEnvironment
Reorg and rename app.*
Consolidate app.AppModule into app.gui.BitsquareAppModule
Replace ConfigLoader with PropertySources in BitsquareEnvironment
Rename i.b.gui.{FatalException=>BitsquareException}
Move APP_NAME_KEY into BitsquareEnvironment