Added tests for Mojo::Stateful
Added tests for Mojo::Stateful

Signed-off-by: Pedro Melo <3e267facec158a22a232125c74f1f09bceb68aac@simplicidade.org>

zoffixznet/mojo,melezhik/mojo,kiwiroy/mojo,CandyAngel/mojo,vlet/mojo,chenri/mojo,vlet/mojo,jenalgit/mojo,lindleyw/mojo,s1037989/mojo,areggiori/mojo,kberov/mojo,polettix/mojo,dolmen/p5-Mojolicious,marcusramberg/mojo,andrewsolomon/mojo,jenalgit/mojo,scottw/mojo,kak-tus/mojo,kraih/mojo,zoffixznet/mojo,s1037989/mojo,augensalat/mojo,dotandimet/mojo,jamadam/mojo,Grinnz/mojo,andrewsolomon/mojo,melezhik/mojo