plugin source mapping fix -- closes #1609

src/routes/meta.js

@@ -26,6 +26,24 @@ function sendStylesheet(req, res, next) {
 	res.type('text/css').send(200, meta.css.cache);
 }
 
+function setupPluginSourceMapping(app) {
+	/*
+		These mappings are utilised by the source map file, as client-side
+		scripts defined in `scripts` in plugin.json are not normally
+		served to the end-user. These mappings are only accessible via
+		development mode (`./nodebb dev`)
+	*/
+	var	routes = plugins.clientScripts,
+		mapping;
+
+	routes.forEach(function(route) {
+		mapping = '/' + route.split('/').slice(7).join('/');
+		app.get(mapping, function(req, res) {
+			res.type('text/javascript').sendfile(route);
+		});
+	});
+}
+
 module.exports = function(app, middleware, controllers) {
 	app.get('/stylesheet.css', sendStylesheet);
 	app.get('/nodebb.min.js', sendMinifiedJS);
@@ -34,5 +52,6 @@ module.exports = function(app, middleware, controllers) {
 
 	if (!minificationEnabled) {
 		app.get('/nodebb.min.js.map', sendSourceMap);
+		setupPluginSourceMapping(app);
 	}
 };