Integrate wercker with bitbucket, firebase, slack

wercker.yml

box: ubuntu

build:
  steps:
    - script:
        name: start build
        code: echo "started building..."

deploy-firebase:
  steps:
    - script:
        name: node installation prep
        code: |
          apt-get update
          apt-get install curl -y

    - script:
        name: node installation
        code: |
          curl -sL https://deb.nodesource.com/setup_4.x | bash
          apt-get install nodejs -y 

    - script:
        name: firebase-deploy
        code: |
          npm install -g firebase-tools
          firebase deploy --project $FIREBASE_PROJECT_NAME --token $FIREBASE_TOKEN

  after-steps:
    - slack-notifier:
        url: $SLACK_WEBHOOK_URL
        username: wercker