Fix word ordering in CSV (and HTML) output

The problem is that the options word order may not correspond to the
words_by_date word order. So for safety, we extract the words directly
from words_by_date rather than relying on the options values.

lib/git_pissed/formats/csv.rb

@@ -9,7 +9,7 @@ def formatted
     end
 
     def table
-      [["date", *options.words].join(',')].tap do |table|
+      [["date", *words_by_date[0][1].keys].join(',')].tap do |table|
         words_by_date.each do |date, words|
           table << [date, *words.values].join(',')
         end