* Upgrade to SA and SF snapshots * Address TODOs regarding those upgrades * Resolve some other TODOs * Replace `PropertyPlaceholderConfigurer` beans with the `<context:property-placeholder>` * Upgrade to Spring Social Twitter 1.1.2 and resolve deprecations via mocks (https://github.com/spring-projects/spring-social-twitter/issues/91) * Upgrade to Curator `3.1.0` and resolve deprecation in the `ZookeeperMetadataStore`