added rotating logging for bunyan

.cfignore

@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
 log
+log.*

.gitignore

@@ -15,3 +15,4 @@ src/client/app.min.js.map
 .sass-cache
 .cfenv
 log
+log.*

src/server/services/logger.js

@@ -11,7 +11,10 @@ try{
 		src: true,
 		name: config.server.http.host,
 		streams: [{
-			path: 'log'
+			type: 'rotating-file',
+			path: 'log',
+			period: '1d',   // daily rotation
+			count: 5        // keep 5 back copies
 		},
 		{
 			level: 'error',
@@ -41,7 +44,10 @@ try{
 		src: true,
 		name: config.server.http.host,
 		streams: [{
-			path: 'log'
+			type: 'rotating-file',
+			path: 'log',
+			period: '1d',   // daily rotation
+			count: 5        // keep 5 back copies
 		}]
 	});
 }