Update doc_parser_spec
Check that YAML::load_file returns a hash
Update display_message_spec to work in older rubies
Remove jruby from integration testing

We currently have a dependency on posix-spawn (I believe from
pygments.rb). It would be nice to support jruby in the future but for
now we should disable this test.
Detect and catch yaml errors in config
Merge pull request #61 from trulia/spec-updates

Fix various issues related to ruby versions and out dated specs