Restore pre-commit.

example-hooks/pre-commit

@@ -0,0 +1,18 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-commit".
+
+#running nose-tests
+echo "Running nose tests. Please wait..."
+nose_output=`nosetests --with-doctest 2>&1`
+error=`echo "$nose_output" | grep Error`
+if [ "$error" != "" ]; then
+        echo "pymatgen nosetest has errors.  Error log: $nose_output" 
+        exit 1
+fi 
+echo "pymatgen nosetest passed. Log: $nose_output"