Add cloudBeesAppDeployArchive task

Task to deploy an archive file to CloudBees.  Based upon WAR deploy,
but adds 'archiveType', 'deltaDeploy', and 'parameters' task parameters.

Unit tests added and I've integration tested a Spring Boot app as both
a Spring Boot JAR and as a .zip file.
Add cloudBeesAppDeployArchive to README

cloudBeesAppDeployArchive task, new extension closure options,
and Spring Boot JAR example.