Enabled Titled Image rendering. No CSS yet

Titled image rendering is enabled by default, and is used if the image
specification contains a title specification, like: ![alt text](image
url "title"). If the title is omitted, the image is rendered normally.

src/DocNet/Utils.cs

@@ -50,6 +50,7 @@ namespace Docnet
 							 DocNetMode = true,
 							 DocumentLocation = documentPath,
 							 DocumentRoot = siteRoot,
+							 HtmlClassTitledImages = "Figure",
 						 };
 
 			var toReturn = parser.Transform(toConvert);

src/MarkdownDeep/MardownDeep.cs

@@ -1002,7 +1002,6 @@ namespace MarkdownDeep
 		// Use CSS to style the figure and the caption
 		public string HtmlClassTitledImages
 		{
-			// TODO:
 			get;
 			set;
 		}

src/MarkdownDeep/SpanFormatter.cs

@@ -35,8 +35,10 @@ namespace MarkdownDeep
 			// Parse the string into a list of tokens
 			Tokenize(str, start, len);
 
-			// Titled image?
-			if (m_Tokens.Count == 1 && m_Markdown.HtmlClassTitledImages != null && m_Tokens[0].type == TokenType.img)
+			// If the image is a titled image and there's a class defined for titled images, we'll render it using special markup, otherwise we'll render
+			// the image as-is. 
+			if (m_Tokens.Count == 1 && !string.IsNullOrWhiteSpace(m_Markdown.HtmlClassTitledImages) && m_Tokens[0].type == TokenType.img &&
+				m_Tokens[0].data is LinkInfo && !string.IsNullOrWhiteSpace(((LinkInfo)m_Tokens[0].data).def.title))
 			{
 				// Grab the link info
 				LinkInfo li = (LinkInfo)m_Tokens[0].data;