Add configuration to use Textile instead of Markdown; change default date format

config.yaml

@@ -1,2 +1,29 @@
-# Configuration file for webgen
-# Used to set the parameters of the plugins
+#####
+# This is the YAML configuration file for webgen used to set configuration options.
+#
+# The general syntax is:
+#
+#   configuration.option.name: value
+#
+# For example, to set a different default language, you would do:
+#
+#   website.lang: de
+#
+# Have a look at the documentation of the individual configuration options to see the allowed format
+# of the values. Since this is a YAML file, you can easily set configuration options as strings,
+# integers, dates, arrays, hashes and more.
+#
+# The available configuration options can be found on the homepage in the Configuration Option
+# Reference at
+#
+#     http://webgen.rubyforge.org/documentation/reference_configuration.html
+#
+# Some common use cases are shown below.
+#####
+
+## The default processing pipeline for page files. If you use a different markup language you need to
+## change 'markdown' to the short name of the content processor for the markup language.
+default_processing_pipeline:
+  Page: erb,tags,textile,blocks,fragments
+
+tag.date.format: '%A, %B %d %H:%M:%S %Z %Y'