Add file extension to code, or Windows breaks

Windows will throw an error if the Python script being executed is
extensionless.
Allow simply returning strings to print

Simply use 'return "my string here"' to make the bot send the message to
the triggered location, rather than having to do 'return
code.say("string here")'.
Fix source unknown error color bleed
Add Newegg auto-responses with newegg.py