Move symbol encoding spec to 1.9 specific section
Move symbol encoding spec to 1.9 specific section

Encoding was introduced in 1.9. Hide those tests for 1.8.

brianmario/yajl-ruby,sferik/yajl-ruby,brianmario/yajl-ruby,sferik/yajl-ruby,sferik/yajl-ruby,brianmario/yajl-ruby