added the basic framework for whats going to be a mozilla security advisory scraping utility

tools/mozilla/security_advisory_scraper/mozilla_security_advisory_scraper.rb

@@ -0,0 +1,40 @@
+require 'rest-client'
+require 'nokogiri'
+
+
+
+## CURRENT ISSUE: 502 BAD GATEWAY WHEN TESTING GET_ADVISORY_URLS METHOD. 
+## TODO: COPY THE EXACT HEADERS THAT YOU ARE GIVING FROM THE WEB BROWSER
+## AND SEND THEM WITH THIS REQUEST AND TEST AGAIN.
+class MozillaSecurityAdvisoryScraper
+  attr_accessor :index_url
+  def initialize()
+    @index_url = "https://www.mozilla.org/en-US/security/advisories"
+  end
+
+  def get_index
+    response = RestClient::Request.execute(
+      :method => :get,
+      :url => index_url
+    )
+    if response.code == 200
+      r.body
+    else
+      puts "HTTP Status code: #{r.code}"
+    end
+  end
+
+  def parse_index(response_body)
+    Nokogiri::HTML(response_body)
+  end
+
+  def advisory_urls(html_doc)
+    html_doc.xpath('//li[@class="level-item"]/a').map {|link| link['href']}
+  end
+
+  def get_advisory_urls
+    body = get_index
+    doc = parse_index(body)
+    advisory_urls(doc)
+  end
+end