Testing the Interactive Shell

It would be nice to automate this, but for now we should do basic manual testing upon release:

• Hit Tab for completions
• Hit tab in the middle of the line
• Hit tab on second line
• Change the window size and hit tab again

Signals:

• Ctrl-C, Ctrl-Z, Ctrl-\ in the shell
• Start cat and run Ctrl-C, Ctrl-Z, Ctrl-\
• Start cat | head and run Ctrl-C, Ctrl-Z, Ctrl-\

Other:

• Ctrl-D to exit shell