Added cf-deploy, cf-undeploy, and cf-swap-deployed tasks.
Fixed bug introduced in start task and fixed spaces task.
Changed deploy tasks to use existing but inactive versions for "next".
Added accessors for extension fields.
Added healthCheckTimeout and stack parameters for app staging, and appStartupTimeout plugin parameter.
Fixed unit issue with healthCheckTimeout. Improved reporting of app startup timeout and errors.
Improved exception reporting in gradle plugin.