added tag for 3.4.1

set release date for 3.4 to today

updated 3.3.7 release date to today

added release notes for 3.3.6

added tests for relativize_paths with urls and anchors

added fog and pygments.rb to gemfile

updated version to 3.3.3

removed nanoc3 executable from gemspec

added John Nishinaga to list of contributors

added nanoc3 executable to gemspec