Add Link Class plugin as submodule

Closes #494

.gitmodules

@@ -109,3 +109,6 @@
 [submodule "post_revision"]
 	path = post_revision
 	url = https://github.com/jhshi/pelican.plugins.post_revision
+[submodule "linkclass"]
+	path = pelican-linkclass
+	url = https://github.com/rlaboiss/pelican-linkclass

Readme.rst

@@ -110,6 +110,8 @@ Interlinks                Lets you add frequently used URLs to your markup using
 
 Libravatar                Allows inclusion of user profile pictures from libravatar.org
 
+Link Class                Allows the insertion of class attributes into generated <a> elements (Markdown only)
+
 Liquid-style tags         Allows liquid-style tags to be inserted into markdown within Pelican documents
 
 Load CSV                  Adds ``csv`` Jinja tag to display the contents of a CSV file as an HTML table

pelican-linkclass

@@ -0,0 +1 @@
+Subproject commit 60dba669dc2770b89ea352da1f84cffdc6d2a8f2