Unzip Jetty before exiting application template

If the user chooses to download Jetty when using the application
template, automatically run 'rake jetty:unzip' before exiting the
script.  Jetty will then be ready to be started by the user.

HYDRASIR-78 #close
Merge pull request #402 from projecthydra/feature/HYDRASIR-78-unzip-jetty-in-application-template

Unzip Jetty before exiting application template