Add a deploy script.

This follows the Hugo deploy guide for GitHub Pages,
https://gohugo.io/hosting-and-deployment/hosting-on-github/#step-by-step-instructions

Author: rgommers

.gitignore

@@ -1,4 +1,3 @@
-public/
 resources/
 
 *.swp
@@ -204,4 +203,4 @@ TAGS
 
 # Files generated when a patch is rejected
 *.orig
-*.rej
+*.rej

.gitmodules

@@ -1,3 +1,7 @@
 [submodule "themes/hugo-fresh"]
 	path = themes/hugo-fresh
 	url = https://github.com/StefMa/hugo-fresh.git
+[submodule "public"]
+	path = public
+	url = [email protected]:numpy/numpy.github.com.git
+	branch = master

deploy.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# If a command fails then the deploy stops
+set -e
+
+printf "\033[0;32mDeploying updates to GitHub...\033[0m\n"
+
+# Build the project.
+hugo
+
+# Go To Public folder
+cd public
+
+# Add changes to git.
+git add .
+
+# Commit changes.
+msg="rebuilding site $(date)"
+if [ -n "$*" ]; then
+	msg="$*"
+fi
+git commit -m "$msg"
+
+# Push source and build repos.
+git push origin master