Add octopress detection

This can be tested [here](http://gamedataeditor.com/cn/),
or [here](http://octopress.org/) or even [here](https://benmmurphy.github.io/).

src/apps.json

@@ -5038,6 +5038,14 @@
 			"implies": "Laravel",
 			"website": "octobercms.com"
 		},
+		"Octopress": {
+			"cats": [
+				11
+			],
+			"html": "Powered by <a href=\"http://octopress.org\">Octopress",
+			"icon": "octopress.png",
+			"website": "octopress.org"
+		},
 		"Odoo": {
 			"cats": [
 				1,