add script to process annotation jsons from COCO and transform them to PASCAL VOC style XML annotation files and made create_data.sh use xml format for lmdb

Author: Eli Selkin

data/coco/create_data.sh

@@ -8,7 +8,7 @@ data_root_dir="$HOME/data/coco"
 dataset_name="coco"
 mapfile="$root_dir/data/$dataset_name/labelmap_coco.prototxt"
 anno_type="detection"
-label_type="json"
+label_type="xml"
 db="lmdb"
 min_dim=0
 max_dim=0