Fix generating contact pages

[bfcoder]

Remove class variables.
Use only one instance of StaffInfo.

This fixes the contact page to contain contact info for only the given course. Also fixes so it works with -m in the task.

[conradbeach]

I had one suggestion but the code and functionality looks good.

[conradbeach]

Lines 68-84 are doing the same thing for each option. Could we dry it up like this?

[:email, :phone, :office_hours, :office_address, :home_page].each do |key|
  append_str body, "<li>#{sym_to_title(key)}: #{opts[key]}</li>", opts[key]
end

The sym_to_title method could look something like this.

def sym_to_title(symbol)
  symbol.to_s.gsub("_", " ").split(/\W/).map(&:capitalize).join(" ")
end

I feel like this would make it easier to read as well.

[bfcoder]

👍 I like that, but your sym_to_title isn't very easy to read. So I'll use Activesupport instead.

[conradbeach]

Ah, I didn't realize we had ActiveSupport. That's definitely a better choice than using what I wrote.

[conradbeach]

Looks great.