Fixed markdown support

We should only relative require when
we are installing the package along with jade. Here
we use it for testing, but require that the user
has it installed

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "support/expresso"]
 	path = support/expresso
 	url = git://github.com/visionmedia/expresso.git
-[submodule "deps/markdown-js"]
-	path = deps/markdown-js
+[submodule "support/markdown"]
+	path = support/markdown
 	url = http://github.com/evilstreak/markdown-js.git

Makefile

@@ -11,10 +11,10 @@ uninstall:
 	rm -f $(LIB_PREFIX)/jade.js
 
 test:
-	@./support/expresso/bin/expresso -I lib test/*.js
+	@./support/expresso/bin/expresso -I lib -I support/markdown/lib test/*.js
 
 test-cov:
-	@./support/expresso/bin/expresso -I lib --cov test/*.js
+	@./support/expresso/bin/expresso -I lib -I support/markdown/lib --cov test/*.js
 
 api.html: lib/jade.js
 	@dox --title "Jade" \

Readme.md

@@ -17,9 +17,9 @@
   - supports [Express JS](http://expressjs.com)
   - no tag prefix
   - filters
-    - :sass
-    - :less
-    - :markdown
+    - :sass must have [sass.js](http://github.com/visionmedia/sass.js) installed
+    - :less must have [less.js](http://github.com/cloudhead/less.js) installed
+    - :markdown must have [markdown-js](http://github.com/evilstreak/markdown-js) installed
     - :cdata
     - :javascript
 

lib/jade.js

@@ -114,7 +114,7 @@ var filters = exports.filters = {
 
     markdown: function(str){
         str = str.replace(/\\n/g, '\n');
-        return require('../deps/markdown-js/lib/markdown').toHTML(str).replace(/\n/g, '\\n').replace(/'/g,''');
+        return require('markdown').toHTML(str).replace(/\n/g, '\\n').replace(/'/g,''');
     }
 };