Allow to set different title for different instances of the app

lib/travis/web/app.rb

@@ -83,6 +83,8 @@ class Travis::Web::App
     def response_for(file, options = {})
       content = File.read(file)
       set_config(content, options) if config_needed?(file)
+      set_title(content) if index?(file)
+
       headers = {
         'Content-Length'   => content.bytesize.to_s,
         'Cache-Control'    => cache_control(file),
@@ -134,6 +136,11 @@ class Travis::Web::App
       Rack::Mime.mime_type File.extname(file)
     end
 
+    def set_title(content)
+      default_title = "Travis CI - Free Hosted Continuous Integration Platform for the Open Source Community"
+      content.gsub!(/\{\{title\}\}/, ENV['SITE_TITLE'] || default_title)
+    end
+
     def set_config(string, opts = {})
       string.gsub! %r(<meta (rel|name)="travis\.([^"]*)" (href|value)="([^"]*)"[^>]*>) do
         %(<meta #{$1}="travis.#{$2}" #{$3}="#{options[$2.to_sym] || $4}">)

public/index.html

@@ -17,7 +17,7 @@
     <meta name="travis.charm_key" value="gy5gx7dy6dh86hxzkz1wmtvupwvievu">
     <meta name="travis.pro" value="false">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Travis CI - Free Hosted Continuous Integration Platform for the Open Source Community</title>
+    <title>{{title}}</title>
     <link rel="dns-prefetch" href="//api.travis-ci.org">
     <link rel="dns-prefetch" href="//ws.pusherapp.com">
     <link rel="dns-prefetch" href="//api.github.com">