Enable RDoc generation using rake.

.gitignore

@@ -7,6 +7,9 @@
 # Ignore bundler config.
 /.bundle
 
+# ignore generated doc
+doc/rdocs
+
 # Ignore the default SQLite database.
 /db/*.sqlite3
 /db/*.sqlite3-journal

lib/tasks/rdoc.rake

@@ -0,0 +1,16 @@
+require 'rdoc/task'
+     
+desc 'generate API documentation to doc/rdocs/index.html'
+     
+Rake::RDocTask.new do |rd|
+  rd.rdoc_dir = 'doc/rdocs'
+  rd.main = 'README.md'
+  rd.rdoc_files.include 'README.md', "config/**/*\.rb", "helpers/**/*\.rb", "script/**/*\.rb" 
+     
+  rd.options << '--inline-source'
+  rd.options << '--line-numbers'
+  rd.options << '--all'
+  rd.options << '--fileboxes'
+  rd.options << '--diagram'
+end
+