As long as you are travelling with a touring agency or with a trusted guide, it is completely safe. Do not get the vibe there are warfare conditions on the east side, just because of you hear on the news. The east side is a huge area and people are still living there safe and sound. And i believe you already want to visit historical places or natural parks which are mostly far away from the danger zone (if there are any danger zone at all) Just don't travel alone without a local turkish guide.