Revert "Disable fluentd due to really bad rubygems."

This reverts commit 8dac4823.

Let's try buildint again after hopefully fixing rubygems issue in
1f9adc65 (*: Pin rubygems library version when used; Do pinning by url)

/cc @klaus, @Tyagov

software/wendelin/software.cfg

@@ -2,7 +2,7 @@
 versions = versions
 extends =
   ../../software/ipython_notebook/software.cfg
-#  ../../component/fluentd/buildout.cfg
+  ../../component/fluentd/buildout.cfg
   ../../component/matplotlib/buildout.cfg
   ../../component/ipython/buildout.cfg
   ../../component/pandas/buildout.cfg
@@ -20,7 +20,7 @@ parts +=
   ipython
   wendelin.core
   matplotlib
-#  fluentd
+  fluentd
   ipython_notebook
 
 [eggs]