Added "LiteServ App" target that builds LiteServ as a GUI app.

For #114 ... not closing the issue yet because the app still needs a
way to start it from a command-line like the old LiteServ tool.
LiteServ.app: Added CLI tool. Signed. Fixed duplicate-class warning.

Fixes #114 (CLI tool)
Fixes #125 (the warning)
LiteServ: Added "Install Tool..." menu command
LiteServ: Improvements to logging

* Redirected logs to ~/Library/Logs/LiteServ.log
* ...unless running in Xcode
* Added "View Logs" menu command
* Shut down CBLManager and CBLListener cleanly on quit.
Merges latest changes.