Continous deployment

If the tests pass, let's just immediately deploy to Heroku.

.travis.yml

@@ -0,0 +1,7 @@
+language: ruby
+rvm:
+  - 1.9.3
+  - rbx-19mode
+env:
+  - secure: "GGJCc4M20IcsaWe43rVbPGtMhXmq38Gv6z0ujJrEKUq64BLwEUqQy19tj5p9\nHubKf60r5kV3d6RCtJ5ib7BD259Ej+1B98hLLb4r5lpoFjqkImVU9Q1YvzCp\nIBXIeHZMahhhTfNbBgmD485feBae9IOB82xK0lQdVNo0E1bm8b8="
+after_success: script/deploy

README.markdown

@@ -25,6 +25,8 @@ is currently deployed.
 
 [/deployed-sha]: http://travis-lite.com/deployed-sha
 
+Travis Lite is set up to deploy as soon as a build passes on master. See `script/deploy` for details.
+
 ## Contributions
 
 See the CONTRIBUTING.md file.

script/deploy

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+cd "$(dirname "$0")/.."
+
+have() { command -v "$1" >/dev/null 2>&1; }
+
+if [[ "$TRAVIS" == "true" ]]; then
+  if [[ "$TRAVIS_PULL_REQUEST" == "true" ]]; then
+    echo "This is a pull request. No deployment will be done."
+    exit 0
+  fi
+  if [[ "$TRAVIS_RUBY_VERSION" != "1.9.3" ]]; then
+    echo "Testing on something other than 1.9.3. No deployment will be done."
+    exit 0
+  fi
+  if [[ "$TRAVIS_BRANCH" != "master" ]]; then
+    echo "Testing on a branch other than master. No deployment will be done."
+    exit 0
+  fi
+
+  wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh
+fi
+
+if ! have heroku; then
+  echo "The heroku toolbelt is not installed. Please install it: https://toolbelt.heroku.com."
+  exit 1
+fi
+
+git remote add heroku git@heroku.com:travis-lite-staging.git
+
+echo "Host heroku.com" >> ~/.ssh/config
+echo "  StrictHostKeyChecking no" >> ~/.ssh/config
+echo "  CheckHostIP no" >> ~/.ssh/config
+echo "  UserKnownHostsFile=/dev/null" >> ~/.ssh/config
+
+branch="$(git symbolic-ref HEAD 2>/dev/null)"
+branch="${branch#refs/heads/}"
+
+mkdir -p ~/.ssh
+ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa -C "travis-deployment"
+
+yes | heroku keys:add
+yes | git push heroku $branch
+yes | heroku keys:remove "travis-deployment"