check the system status
adds support for subfolders in /templates

- most useful e.g., if you have lots of instruction pages, you can make an 'instructions' subfolder to keep things organized
'exit' command wasn't shutting down server like 'quit' or 'eof' did.

- fixed
passes open command through to command line

i find this too useful on os x not to have available.  always needing to pop open finder in the project folder.

examples:
	open .  - opens current folder
	open templates - opens template folder

this could be fancier supporting all the options of open, but ok for now.
all routes need to return something

- otherwise Flask generated error messages to the log