Convert command line output to UTF-8 for all remaining commands as necessary.

[keithrbennett]

Issue #17 involved piping output through iconv on the command line to convert Mac Roman encoding to UTF-8 for the commands that list SSID's (WiFi network names).

This conversion may be necessary for other (possibly all) Mac WiFi utility calls.

Steps to complete:

1. Research the other calls and determine which need to be changed.
2. If the number justifies it, look into refactoring to reduce code repetition.
3. Change the command calls to include iconv.