Add helpers that don’t output unicode chars on windows

These checkmarks and x characters appear to show up as the
box/? character using the default powershell/command prompt
settings
logCommandResult => logCommandResults
Use logCommandResult helper in Clean command
Use logCommandResults helper in Dedupe command
Use unicode x in log failure helper
Use log helpers in Develop commmand
Use log helpers in Login command
Use log helpers in Unpublish command
Use log helpers in Unlink command
Use log helpers in Uninstall command
Use log helpers in Rebuild command
Use log helpers in Publish command
Use log helpers in Install command
Extend Command in Unlink class
Extend Command in all commands
Make failures red
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Merge pull request #119 from atom/ks-no-unicode-on-windows

Don't log unicode characters on Windows