Default Command + Raising of Exceptions

I'm using your gem for an internal CLI project. I needed to add/change some features for the application, and wanted to share the features back upstream. In particular, catching every exception was causing us a lot of pain; catching every exception was forcing us to `kill -9` every process/command that hung. I've modified the exception handling to provide a dedicated error for internal command resolution issues as well as catching Interrupt (Ctrl-C) while a command is executing, providing the expected behavior (Ctrl-C kills the current command while it's running, kills the CLI-Console shell if it isn't). [Here](http://stackoverflow.com/questions/10048173/why-is-it-bad-style-to-rescue-exception-e-in-ruby) is a relevant StackOverflow on this topic.

The default command feature I added is entirely optional and shouldn't affect existing usage of CLI-Console. Simply put, I am using it to expose a SQL-like interface, without having to write something like "query" before every command.



Thanks for you consideration.