add versionable trait to generated app
add versionable trait to generated app

Signed-off-by: Stephen Crosby <615fa4941ee216ba31ec3aa51dee96b020bd0f81@gmail.com>

rightscale/praxis,Thann/praxis,blanquer/praxis,Thann/praxis,tony-spataro-rs/praxis,smcgivern/praxis,praxis/praxis,gampleman/praxis,smcgivern/praxis,Thann/praxis,justingaylor/praxis,rightscale/praxis,gampleman/praxis,tony-spataro-rs/praxis,smcgivern/praxis,gampleman/praxis,rightscale/praxis,justingaylor/praxis,tony-spataro-rs/praxis,blanquer/praxis