Implemented <parse>, <storage> etc sections within fluentd::source template

- Changed templates/source.erb to accept Hash elements within 'config'
- Updated source_spec test
- Updated README.md

examples/source.pp

@@ -5,6 +5,14 @@
     'type'   => 'tail',
     'format' => 'json',
     'path'   => '/var/log/test-application/*.json',
+    'parse'  => {
+      'type'       => 'regexp',
+      'expression' => '^(?<name>[^ ]*) (?<user>[^ ]*) (?<age>\d*)$'
+    },
+    'storage'=> {
+      'type'   => 'local',
+      'path'   => 'test.pos'
+    },
     'tag'    => 'application.test'
   }
 }