config for compatibility with tensorflow 0.11 and 0.12

+import tensorflow as tf
+
+# configuration for tensorflow 0.11 and 0.12 version
+try:
+    # tensorflow 0.12 version
+    image_summary = tf.summary.image
+    scalar_summary = tf.summary.scalar
+    histogram_summary = tf.summary.histogram
+    merge_summary = tf.summary.merge_all
+    SummaryWriter = tf.summary.FileWriter
+except:
+    # tensorflow <= 0.11 version
+    image_summary = tf.image_summary
+    scalar_summary = tf.scalar_summary
+    histogram_summary = tf.histogram_summary
+    merge_summary = tf.merge_all_summaries
+    SummaryWriter = tf.train.SummaryWriter
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