Merge branch '2.1' of git://github.com/imathis/octopress into master

Conflicts:
	.gitignore
	.rbenv-version
	.rvmrc
	.themes/classic/source/javascripts/github.js
	.themes/classic/source/javascripts/pinboard.js
	.themes/classic/source/javascripts/twitter.js
	Gemfile
	Gemfile.lock
	Rakefile
	_config.yml
	plugins/octopress_filters.rb
Removed comments by default
Added external-url to latest link posts
New post