[#211] Override the Rails doc:app task to include our doc layout

doc/README_FOR_APP

-= Redmine
-
-Redmine is a flexible project management web application written using Ruby on Rails framework.
-
-More details can be found at http://www.redmine.org

lib/tasks/documentation.rake

+#clear the doc:app task et al
+Rake::Task["doc:app"].clear
+Rake::Task["doc/app"].clear
+Rake::Task["doc/app/index.html"].clear
+
+namespace :doc do
+  desc "Generate documentation for the application. Set custom template with TEMPLATE=/path/to/rdoc/template.rb or title with TITLE=\"Custom Title\""
+  Rake::RDocTask.new("app") { |rdoc|
+    rdoc.rdoc_dir = 'doc/app'
+    rdoc.template = ENV['template'] if ENV['template']
+    rdoc.title    = ENV['title'] || "ChiliProject"
+    rdoc.options << '--line-numbers' << '--inline-source'
+    rdoc.options << '--charset' << 'utf-8'
+    rdoc.rdoc_files.include('app/**/*.rb')
+    rdoc.rdoc_files.include('lib/**/*.rb')
+    rdoc.rdoc_files.include('README.rdoc')
+    rdoc.rdoc_files.include('doc/*.rdoc')
+    rdoc.main = 'README.rdoc'
+  }
+end