added showblocks script

scripts/show-blocks.py

@@ -0,0 +1,11 @@
+import sys
+import os
+import stem
+
+if not os.path.exists('onionr.sh'):
+    os.chdir('../')
+sys.path.append("src/")
+from coredb.blockmetadb import get_block_list
+
+for bl in get_block_list():
+    print(bl)