Make timeout configurable, mention in docs

Readme.md

@@ -52,6 +52,7 @@ This screenshot shows an airbrake error send from this module:
 * Support for [long-stack-traces][]
 * Optional auto-handler for `uncaughtException` events
 * Provides notification url linking to airbrake in `notify()` callback
+* Timeout airbrake requests after 30 seconds, you never know
 
 [long-stack-traces]: https://github.com/tlrobinson/long-stack-traces
 
@@ -144,6 +145,10 @@ The version of this app. Set to a semantic version number, or leave unset.
 
 The protocol to use.
 
+### airbrake.timeout = 30 * 1000
+
+The timeout after which to give up trying to notify airbrake in ms.
+
 ### airbrake.handleExceptions()
 
 Registers a `process.on('uncaughtException')` listener. When an uncaught

lib/airbrake.js

@@ -17,6 +17,7 @@ function Airbrake() {
   this.env = process.env.NODE_ENV;
   this.projectRoot = null;
   this.appVersion = null;
+  this.timeout = 30 * 1000;
 
   // Disabled, see comments in appendServerEnvironmentXml()
   // this.hostname = os.hostname();
@@ -65,7 +66,7 @@ Airbrake.prototype.notify = function(err, cb) {
     method: 'POST',
     url: this.url('/notifier_api/v2/notices'),
     body: body,
-    timeout: 30 * 1000,
+    timeout: this.timeout,
     headers: {
       'Content-Length': body.length,
       'Content-Type': 'text/xml',