Switch to CloudBees 'iui' account.

 * Update deploy scripts
 * Bump app.version to 0.1.2
 * Upgrade to Grails 2.2.2
 * Update to servlet 2.5
 * Set grails.project.{target,source}.level to 1.6
 * Add plugins.tomcat=2.2.2 to application.properties
 * Update README.md for new CI URL
Use jetty plugin to avoid conflict with CloudBees