Added TimberTest::testGetPostPreview
Added TimberTest::testGetPostPreview

Test creates a post and a preview and sets the appropriate GET params for previews. It eventually checks if it gets the content from the autosave, instead of from the original post.
xavierpriour/timber,pensesmart/timber,anugupta/timber,Jmayhak/timber,timber/timber,pensesmart/timber,mojaray2k/timber,rpkoller/timber,rpkoller/timber,josephbergdoll/timber,ogrosko/timber,PrisisForks/timber,mgmartel/timber,jarednova/timber,xavivars/timber,gchtr/timber,gchtr/timber,blocher/timber,joelgarciajr84/timber,aprendiendoando/timber,joelgarciajr84/timber,PrisisForks/timber,mgmartel/timber,josephbergdoll/timber,mojaray2k/timber,blocher/timber,ogrosko/timber,anugupta/timber,aprendiendoando/timber,Jmayhak/timber,Jmayhak/timber,lucasmichot/timber,aprendiendoando/timber,jnweaver/timber,timber/timber,pensesmart/timber,xavivars/timber,mgmartel/timber,aaemnnosttv/timber,aaemnnosttv/timber,gbarberi/timber,rpkoller/timber,joelgarciajr84/timber,jarednova/timber,lucasmichot/timber,PrisisForks/timber,xavierpriour/timber,gbarberi/timber,josephbergdoll/timber,anugupta/timber,gbarberi/timber,jarednova/timber,mojaray2k/timber,jnweaver/timber,xavierpriour/timber,jnweaver/timber,xavivars/timber,lucasmichot/timber,ogrosko/timber,gchtr/timber,blocher/timber,aaemnnosttv/timber