Change to dark theme
	modified:   _includes/themes/twitter/default.html
	modified:   _includes/themes/twitter/page.html
	modified:   _includes/themes/twitter/post.html
	deleted:    assets/themes/twitter/bootstrap/css/bootstrap.2.2.2.min.css
	deleted:    assets/themes/twitter/bootstrap/img/glyphicons-halflings-white.png
	deleted:    assets/themes/twitter/bootstrap/img/glyphicons-halflings.png
	modified:   assets/themes/twitter/css/style.css
	modified:   index.md