added a hook to post image upload for starters, more coming

src/posts.js

@@ -396,6 +396,10 @@ var db = require('./database'),
 
 	Posts.uploadPostImage = function(image, callback) {
 
+		if(plugins.hasListeners('filter:post.upload')) {
+			plugins.fireHook('filter:post.upload', image, callback);
+		} else {
+
 			if(meta.config.imgurClientID) {
 				if(!image || !image.data) {
 					return callback(new Error('invalid image'));
@@ -417,6 +421,7 @@ var db = require('./database'),
 				callback(new Error('Uploads are disabled!'));
 			}
 		}
+	}
 
 	Posts.uploadPostFile = function(file, callback) {