Add first pass at migration mode.

pre_commit/resources/pre-commit-hook

@@ -1,4 +1,10 @@
 #!/usr/bin/env bash
+# This is a randomish md5 to identify this script
+# d8ee923c46731b42cd95cc869add4062
+
+HERE=$(dirname $(readlink -f "$0"))
+
+retv=0
 
 which pre-commit > /dev/null
 if [ $? -ne 0 ]; then
@@ -6,4 +12,20 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
+
+# Run the legacy pre-commit if it exists
+if [ -x "$HERE"/pre-commit.legacy ]; then
+    "$HERE"/pre-commit.legacy
+    if [ $? -ne 0 ]; then
+        retv=1
+    fi
+fi
+
+
+# Run pre-commit
 pre-commit
+if [ $? -ne 0 ]; then
+    retv=1
+fi
+
+exit $retv