Path refresh refactor, comments, and error messagesevryloop

The 'eval' function was renamed to 'repl'.

The code to refresh the $PATH was moved into it's own function:
'prefresh', and is now being called in three locations:
  - At the beginning of 'repl', before the main loop
  - Inside the main loop, possibly during a path search if the command
    is not initially found
  - Inside the main loop, if the call to Command::spawn() throws an
    error, and the error is ErrorKind::NotFound

Doc comments were added for each function, as well as a few more
comments throughout that detail the program's control flow.

The error messages in the main repl loop were cleaned up to have a more
consistent style, and to provide more/better detail.

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