add release script

scripts/deploy

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+function untag () {
+  git tag -d $1
+  git push origin --delete $1
+}
+
+## Verify nothing is unstaged or untracked
+status=$(git status -s)
+if [ -n "$status" ]; then
+  echo "branch isn't clean: commit staged files and / or discard untracked files!"
+  echo $status
+  exit 1
+fi
+
+## Verify code compiles
+echo "compiling library" && elm make || exit 1
+rm -f index.html
+
+## Get version number
+version=$(cat elm.json | grep '"version"' | sed 's/\([^0-9]*\)\([0-9]\.[0-9]\.[0-9]\)\(.*\)/\2/')
+if [ -z "$version" ]; then
+  echo "unable to capture package version"
+  exit 1
+else
+  echo "VERSION: $version"
+fi
+
+## Create tag and publish
+trap 'untag $version' 1
+git tag -d $version 1>/dev/null 2>&1
+git tag -a $version -m "release version $version" && git push origin $version
+elm publish || exit 1