Update Makefile and add git pre-push hook (#1382)

githooks/README.md

@@ -0,0 +1,7 @@
+# Git hooks
+
+* pre-push: Check, build and test the changes.
+
+```bash
+$ cp githooks/* .git/hooks/
+```

githooks/pre-push

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+ROOT=`realpath $(dirname $0)/../..`
+pushd $ROOT
+make
+popd