add GPU svo under development

GPU_version/svo/test/README.md

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+#### Download Test Data
+
+Create a folder where you will store all datasets, e.g.:
+
+    mkdir Datasets
+
+In your `.bashrc` script, create a new environment variable pointing to the dataset folder:
+
+    export SVO_DATASET_DIR=${HOME}/Datasets
+
+Source your new `.bashrc` script, go to the new dataset folder and download the test data:
+
+    source ~/.bashrc
+    cd ${SVO_DATASET_DIR}
+    wget http://rpg.ifi.uzh.ch/datasets/sin2_tex2_h1_v8_d.tar.gz -O - | tar -xz
+
+You can then run the tests, e.g.:
+
+    rosrun svo test_pipeline
+
+or if you are not using ROS:
+
+    cd svo/bin
+    ./test_pipeline