add script to produce monthly reports

bin/get_monthly_data

+#!/bin/env ruby
+
+#
+# Do not modify below
+#
+
+require 'rubygems'
+require 'bundler/setup'
+
+require 'date'
+
+START_DATE  = Date.strptime(ENV["START_DATE"] || "2017-01", "%Y-%m")
+END_DATE    = Date.strptime(ENV["END_DATE"]   || "2018-03", "%Y-%m")
+
+(START_DATE..END_DATE).map do |d|
+  [
+    Date.new(d.year, d.month,  1),
+    Date.new(d.year, d.month, -1)
+  ]
+end.uniq.each do |first, last|
+  puts "Getting data for #{first} .. #{last}"
+  puts "========================================="
+  puts ""
+  system %{START_DATE="#{first}" END_DATE="#{last}" bin/get_data && bin/metrics >> report.txt}
+  system %{echo "" >> report.txt}
+  puts ""
+end