Reduce verbosity of plugin incompatibility errors

Instead of showing a 4-5 line warning for each potentially incompatible
plugin, we'll show the warning and then a list of plugins.

src/plugins.js

@@ -31,6 +31,7 @@ var fs = require('fs'),
 	Plugins.clientScripts = [];
 	Plugins.customLanguages = [];
 	Plugins.libraryPaths = [];
+	Plugins.versionWarning = [];
 
 	Plugins.initialized = false;
 
@@ -74,6 +75,7 @@ var fs = require('fs'),
 		Plugins.libraries = {};
 		Plugins.loadedHooks = {};
 		Plugins.staticDirs = {};
+		Plugins.versionWarning = [];
 		Plugins.cssFiles.length = 0;
 		Plugins.lessFiles.length = 0;
 		Plugins.clientScripts.length = 0;
@@ -106,6 +108,16 @@ var fs = require('fs'),
 				});
 			},
 			function(next) {
+				// If some plugins are incompatible, throw the warning here
+				if (Plugins.versionWarning.length) {
+					process.stdout.write('\n');
+					winston.warn('[plugins/load] The following plugins may not be compatible with your version of NodeBB. This may cause unintended behaviour or crashing. In the event of an unresponsive NodeBB caused by this plugin, run `./nodebb reset -p PLUGINNAME` to disable it.');
+					for(var x=0,numPlugins=Plugins.versionWarning.length;x<numPlugins;x++) {
+						process.stdout.write('  * '.yellow + Plugins.versionWarning[x].reset + '\n');
+					}
+					process.stdout.write('\n');
+				}
+
 				Object.keys(Plugins.loadedHooks).forEach(function(hook) {
 					var hooks = Plugins.loadedHooks[hook];
 					hooks = hooks.sort(function(a, b) {

src/plugins/load.js

@@ -20,7 +20,7 @@ module.exports = function(Plugins) {
 				return callback(pluginPath.match('nodebb-theme') ? null : err);
 			}
 
-			versionWarning(pluginData);
+			checkVersion(pluginData);
 
 			async.parallel([
 				function(next) {
@@ -53,20 +53,19 @@ module.exports = function(Plugins) {
 		});
 	};
 
-	function versionWarning(pluginData) {
-		function display() {
-			process.stdout.write('\n');
-			winston.warn('[plugins/' + pluginData.id + '] This plugin may not be compatible with your version of NodeBB. This may cause unintended behaviour or crashing.');
-			winston.warn('[plugins/' + pluginData.id + '] In the event of an unresponsive NodeBB caused by this plugin, run ./nodebb reset -p ' + pluginData.id + '.');
-			process.stdout.write('\n');
+	function checkVersion(pluginData) {
+		function add() {
+			if (Plugins.versionWarning.indexOf(pluginData.id) === -1) {
+				Plugins.versionWarning.push(pluginData.id);
+			}
 		}
 
 		if (pluginData.nbbpm && pluginData.nbbpm.compatibility && semver.validRange(pluginData.nbbpm.compatibility)) {
 			if (!semver.satisfies(nconf.get('version'), pluginData.nbbpm.compatibility)) {
-				display();
+				add();
 			}
 		} else {
-			display();
+			add();
 		}
 	}