[DRE-maint] ruby-gon is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-gon 5.0.4-1 is marked for autoremoval from testing on 2014-09-29

It is affected by these RC bugs:
759909: ruby-gon: FTBFS: ERROR: Test "ruby2.1" failed:      Failure/Error: expect(@base.include_gon).to eq("<script type=\"text/javascript\">" +