Setup automated deploys

This commit sets up automated deploys using Travis.

The inspiration for many of these changes came from the [Micropurchase app's config](https://github.com/18F/micropurchase/blob/develop/.travis.yml).

To enable automated deploys, this commit does the following:

- Add a deploy script that takes an environment as an argument and deploys to the appropriate app on cloud.gov
- Modify the Travis configuration to add the keys that travis needs to deploy to cloud.gov

closes #204

.travis.yml

@@ -4,10 +4,24 @@ before_script:
 bundler_args: "--deployment --jobs=3 --retry=3 --without development"
 cache: bundler
 env:
-- DB=postgresql
+  global:
+    - DB=postgresql
+    - CF_USERNAME= < pending deploy user setup >
+    secure: < pending deploy user setup >
 language: ruby
 rvm:
 - ruby-2.3.1
 sudo: false
 script:
 - bundle exec rake
+deploy:
+  - provider: script
+    script: "./bin/deploy.sh staging"
+    skip_cleanup: true
+    on:
+      branch: develop
+  - provider: script
+    script: "./bin/deploy.sh production"
+    skip_cleanup: true
+    on:
+      branch: master

bin/deploy.sh

@@ -0,0 +1,19 @@
+
+set -e
+
+API="https://api.cloud.gov"
+ORG="18f"
+SPACE="dolores"
+ENVIRONMENT=$1
+
+if [ $ENVIRONMENT = 'production' ]; then
+  NAME="dolores-app"
+elif [ $ENVIRONMENT = 'staging' ]; then
+  NAME="dolores-staging"
+else
+  echo "Unknown environment: $ENVIRONMENT"
+  exit
+fi
+
+cf login --a $API --u $CF_USERNAME --p $CF_PASSWORD --o $ORG -s $SPACE
+cf push $NAME