feat(server): Add public api to force a file list refresh.

docs/dev/04-public-api.md

@@ -22,6 +22,14 @@ Equivalent of `karma start`.
 server.start()
 ```
 
+### **server.refreshFiles()**
+
+Trigger a file list refresh. Returns a promise.
+
+```javascript
+server.refresh()
+```
+
 ### Events
 
 The `server` object is an [`EventEmitter`](https://nodejs.org/docs/latest/api/events.html#events_class_events_eventemitter). You can simply listen to events like this:

lib/server.js

@@ -1,6 +1,7 @@
 var SocketIO = require('socket.io')
 var di = require('di')
 var util = require('util')
+var Promise = require('bluebird')
 
 var cfg = require('./config')
 var logger = require('./logger')
@@ -98,13 +99,22 @@ Server.prototype.get = function (token) {
   return this._injector.get(token)
 }
 
+// Force a refresh of the file list
+Server.prototype.refreshFiles = function () {
+  if (!this._fileList) return Promise.resolve()
+
+  return this._fileList.refresh()
+}
+
 // Private Methods
 // ---------------
 
 Server.prototype._start = function (config, launcher, preprocess, fileList, webServer,
                                     capturedBrowsers, socketServer, executor, done) {
   var self = this
 
+  self._fileList = fileList
+
   config.frameworks.forEach(function (framework) {
     self._injector.get('framework:' + framework)
   })