Merge branch 'posts/ag-hal-with-rpc'
Created tag redirect

- Planet PHP has been requesting `/blog/tag/php.xml`, but the tags in my
  blog use the format `/blog/tag/php-rss.xml` and/or
  `/blog/tag/php-atom.xml`. Created a redirect that will match the
  pattern and redirect to the RSS variant.
Merge branch 'hotfix/tag-rss-redirect' into develop