add category_order plugin

And also fix typo in readme file

.gitmodules

@@ -100,3 +100,6 @@
 [submodule "backreftranslate"]
 	path = backreftranslate
 	url = https://github.com/daltonmatos/pelican-plugin-backref-translate
+[submodule "category_order"]
+	path = category_order
+	url = https://github.com/jhshi/pelican.plugins.category_order.git

Readme.rst

@@ -52,6 +52,8 @@ Better figures/samples    Adds a `style="width: ???px; height: auto;"` attribute
 
 bootstrapify              Automatically add bootstraps default classes to your content, usefull for md generated tables
 
+Category Order            Order categories (and tags) by the number of articles in that category (or tag).
+
 CJK auto spacing          Inserts spaces between Chinese/Japanese/Korean characters and English words
 
 Clean summary             Cleans your summary of excess images

category_order

@@ -0,0 +1 @@
+Subproject commit 0f1a86e566cc38b2137ca66a107a08d4fa56a981