Generate releases notes using releases.rb

Make releases notes layout and urls consistent with the alerts page
Add RSS feed in download and version-history pages
Add a canonical page with a redirect to the new url
Simplify releases notes layouts

_plugins/releases.rb

@@ -0,0 +1,51 @@
+require 'yaml'
+
+module Jekyll
+  
+  class ReleasePage < Page
+    def initialize(site, base, lang, srcdir, src, dstdir, dst, year, month, day)
+      @site = site
+      @base = base
+      @dir = '/'+dstdir
+      @name = dst.gsub('.md','.html')
+      self.process(dst)
+      self.read_yaml(File.join(base, srcdir), src)
+      self.data['lang'] = lang
+      self.data['date'] = year + '-' + month + '-' + day
+      self.data['layout'] = 'release'
+      if dstdir.index('/releases/') === 0
+        self.data['redirect'] = dst.gsub('.md','')
+      else
+        self.data['category'] = 'release'
+        site.pages << ReleasePage.new(site, base, lang, srcdir, src, '/releases/' + year + '/' + month + '/' + day, dst, year, month, day)
+      end
+    end
+  end
+
+  class ReleasePageGenerator < Generator
+    def generate(site)
+      #generate each release based on templates
+      Dir.foreach('_releases') do |file|
+        next if file == '.' or file == '..'
+        lang = 'en'
+        src = file
+        dst = file.split('-')
+        next if dst.length < 4
+        year = dst.shift()
+        month = dst.shift()
+        day = dst.shift()
+        next if !/^[0-9]{4}$/.match(year)
+        next if !/^[0-9]{2}$/.match(month)
+        next if !/^[0-9]{2}$/.match(day)
+        dst = dst.join('-')
+        srcdir = '_releases'
+        dstdir = lang + '/release'
+        site.pages << ReleasePage.new(site, site.source, lang, '_releases', src, dstdir, dst, year, month, day)
+      end
+      #TODO releases are only generated for english language,
+      #but they could also be translated at some point. They would however
+      #need to fallback to english when no translation is available.
+    end
+  end
+
+end