Allow users to specify the log level via JEKYLL_LOG_LEVEL.

lib/jekyll.rb

@@ -112,7 +112,7 @@ module Jekyll
     #
     # Returns the LogAdapter instance.
     def logger
-      @logger ||= LogAdapter.new(Stevenson.new)
+      @logger ||= LogAdapter.new(Stevenson.new, (ENV["JEKYLL_LOG_LEVEL"] || :info).to_sym)
     end
 
     # Public: Set the log writer.

lib/jekyll/entry_filter.rb

@@ -47,7 +47,7 @@ module Jekyll
 
     def excluded?(entry)
       excluded = glob_include?(site.exclude, relative_to_source(entry))
-      Jekyll.logger.debug "excluded?(#{relative_to_source(entry)}) ==> #{excluded}"
+      Jekyll.logger.debug "EntryFilter:", "excluded?(#{relative_to_source(entry)}) ==> #{excluded}"
       excluded
     end