added video tag plugin

plugins/video_tag.rb

@@ -0,0 +1,47 @@
+# Title: Simple Video tag for Jekyll
+# Author: Brandon Mathis http://brandonmathis.com
+# Description: Easily output MPEG4 HTML5 video with a flash backup.
+#
+# Syntax {% video url/to/video [width height] [url/to/poster] %}
+#
+# Example:
+# {% video http://site.com/video.mp4 720 480 http://site.com/poster-frame.jpg %}
+#
+# Output:
+# <video width='720' height='480' preload='none' controls poster='http://site.com/poster-frame.jpg'>
+#   <source src='http://site.com/video.mp4' type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"'/>
+# </video>
+#
+
+module Jekyll
+
+  class VideoTag < Liquid::Tag
+    @video = nil
+    @poster = ''
+    @height = ''
+    @width = ''
+
+    def initialize(tag_name, markup, tokens)
+      if markup =~ /((https?:\/\/|\/)(\S+))(\s+(\d+)\s(\d+))?(\s+(https?:\/\/|\/)(\S+))?/i
+        @video  = $1
+        @width  = $5
+        @height = $6
+        @poster = $7
+      end
+      super
+    end
+
+    def render(context)
+      output = super
+      if @video
+        video =  "<video width='#{@width}' height='#{@height}' preload='none' controls poster='#{@poster}'>"
+        video += "<source src='#{@video}' type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"'/></video>"
+      else
+        "Error processing input, expected syntax: {% video url/to/video [width height] [url/to/poster] %}"
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag('video', Jekyll::VideoTag)
+